'The Monica Seles Challenge: 5 Weeks to Jump Start Your Life' to inspire
        listeners to live a happier, healthier, more confident life
Seles to welcome athletes, celebrities, real women and other special guests
                                 in studio

    NEW YORK, Sept. 3 /PRNewswire/ -- SIRIUS XM Radio (Nasdaq:
SIRI) announced today that internationally acclaimed tennis superstar
Monica Seles will host an exclusive live call-in show aimed at empowering
women everywhere to lead their best life. The Monica Seles Challenge: 5
Weeks to Jump Start Your Life will air in five weekly installments airing
every Thursday from September 4th through October 2nd from 1:00 - 3:00 pm
ET on SIRIUS Stars channel 102. Seles will host the show from SIRIUS XM
Radio's Rockefeller Center studios.

    

    Seles has long been a role model for women and on SIRIUS she will have
a forum to speak candidly about both the troubles and successes she faced
in her own life and how these experiences made her stronger. With The
Monica Seles Challenge, Seles encourages listeners to join her on a
five-week journey toward feeling strong, beautiful, happy and healthy - on
the inside and out. Seles' goal is to help women realize their best
possible selves across all aspects of their lives, personal, professional,
emotional and beyond.

    Seles will welcome expert guests, athletes, celebrities and real women
and will take calls from around the country.

    "I love radio and the unique way it has to reach out to people with a
real and personal exchange of ideas and stories," said Monica Seles.
"SIRIUS has provided just such an opportunity for me, my studio guests and
the SIRIUS audience to share our life experiences, learn from them, and
hopefully forge ahead into a happier and healthier future."

    "Monica Seles is an extraordinary person whose passion, determination
and courage - both on and off the court - shaped her into the world-class
athlete and woman she is today," said Scott Greenstein, President and Chief
Content Officer, SIRIUS XM Radio. "On SIRIUS, these qualities will
translate into compelling radio as she empowers and inspires listeners
across the country."

    Over Seles' extraordinary tennis career, she earned nine Grand Slam
titles and won 53 singles and six doubles tournaments. She first became No.
1 in the world in March 1991. Seles was No. 1 for 178 weeks during the next
two years- the youngest No. 1 ever at the time- until tragedy struck in
April 1993 when she was stabbed in the back by a deranged fan during a
match in Germany. She wasn't able to play again for more than two years.
When she returned to tennis, she won hearts with her comeback win at the
Canadian Open and then reached the US Open Final the following month.
Remarkably, she won her ninth Grand Slam title at the Australian Open in
January 1996. Seles joined the cast of ABC-TV's hit "Dancing with the
Stars" in 2008. Seles is currently writing her memoir, Getting a Grip: On
My Body, My Mind, My Self, in which she explores her remarkable journey of
tennis, fame, tragedy, loss and self-discovery. Her book is scheduled for
publication in March 2009 by Avery, an imprint of Penguin Group (USA).

    About SIRIUS XM Radio

    SIRIUS XM Radio is America's satellite radio company delivering "The
Best Radio on Radio" to more than 18 million subscribers, including 100%
commercial free music, and premier sports, news, talk, entertainment,
traffic and weather.

    SIRIUS XM Radio has exclusive content relationships with an array of
personalities and artists, including Howard Stern, Oprah, Martha Stewart,
Jimmy Buffett, Elvis, Jamie Foxx, Barbara Walters, Frank Sinatra, Opie &
Anthony, The Grateful Dead, Willie Nelson, Bob Dylan, Dale Earnhardt Jr.,
Tom Petty, and Bob Edwards. SIRIUS XM Radio is the leader in sports
programming as the Official Satellite Radio Partner of the NFL, Major
League Baseball, NASCAR, NHL, and PGA Tour, and broadcasts major college
sports.

    SIRIUS XM Radio has exclusive arrangements with every major automaker.
SIRIUS XM Radio products are available at shop.sirius.com and
shop.xmradio.com, and at retail locations nationwide, including Best Buy,
Circuit City, RadioShack, Target, Sam's Club, and Wal-Mart.

    SIRIUS XM Radio also offers SIRIUS Backseat TV, the first ever live
in-vehicle rear seat entertainment featuring Nickelodeon, Disney Channel
and Cartoon Network; XM NavTraffic service for GPS navigation systems
delivers real-time traffic information, including accidents and road
construction, for more than 80 North American markets.

    This communication contains "forward-looking statements" within the
meaning of the Private Securities Litigation Reform Act of 1995. Such
statements include, but are not limited to, statements about the benefits
of the business combination transaction involving Sirius XM Radio Inc. and
XM Satellite Radio Holdings Inc., including potential synergies and cost
savings and the timing thereof, future financial and operating results, the
combined company's plans, objectives, expectations and intentions with
respect to future operations, products and services; and other statements
identified by words such as "anticipate," "believe," "plan," "estimate,"
"expect," "intend," "will," "should," "may," or words of similar meaning.
Such forward-looking statements are based upon the current beliefs and
expectations of SIRIUS' and XM's management and are inherently subject to
significant business, economic and competitive uncertainties and
contingencies, many of which are difficult to predict and generally beyond
the control of SIRIUS and XM. Actual results may differ materially from the
results anticipated in these forward-looking statements.

    The following factors, among others, could cause actual results to
differ materially from the anticipated results or other expectations
expressed in the forward-looking statement: general business and economic
conditions; the performance of financial markets and interest rates; the
ability to obtain governmental approvals of the transaction on a timely
basis; the failure to realize synergies and cost-savings from the
transaction or delay in realization thereof; the businesses of SIRIUS and
XM may not be combined successfully, or such combination may take longer,
be more difficult, time-consuming or costly to accomplish than expected;
and operating costs and business disruption following the merger, including
adverse effects on employee retention and on our business relationships
with third parties, including manufacturers of radios, retailers,
automakers and programming providers. Additional factors that could cause
SIRIUS' and XM's results to differ materially from those described in the
forward-looking statements can be found in SIRIUS' and XM's Annual Reports
on Form 10-K for the year ended December 31, 2007 and their respective
Quarterly Reports on Form 10-Q for the Quarter ended June 30, 2008, all of
which are filed with the Securities and Exchange Commission (the "SEC") and
available at the SEC's Internet site (http://www.sec.gov). The information
set forth herein speaks only as of the date hereof, and SIRIUS and XM
disclaim any intention or obligation to update any forward looking
statements as a result of developments occurring after the date of this
communication.



    P-SIRI

    Contact for SIRIUS XM Radio:
    Hillary Schupf
    SIRIUS
    212 901 6739
    hschupf@siriusradio.com