POTW: Kevin Jonas, Jay-Z, Lady Gaga, Rihanna
POTW: Kevin Jonas, Jay-Z, Lady Gaga, Rihanna

Kevin Jonas pitched at the baseball game, Jay-Z embraced Michael Jordan, Lady Gaga crowd-surfed, Rihanna showed off her new tattoo, Ke$ha got comfy on the "Today" show, Katy Perry emulated "Ugly Betty," Ciara and Justin Bieber got cozy, Rick Ross, Fabolous and Jay posed for the paps, Bono got snuggly, M.I.A. dropped it low and Usher and Ci-Ci shared a hug with President Bill Clinton. It all happened ths week and we've got the pics to prove it.

SEE THE PHOTOS OF THE WEEK | POTW MAIN PAGE

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2. Nicki Minaj Finishing Next Single, Says Young Money 'Keeps Me Grounded'

3. Katy Perry: No One Suing Over 'California Gurls'

4. Kat Von D's 20 Celeb Tattoo Tour

5. Trey Songz: The Billboard Cover Story