Lady Gaga – 25 Celebrity Encounters

In honor of Lady Gaga's 25th birthday, we've complied a gallery of photographs featuring just a small fraction of her celebrity encounters from these past few years. You'll see her meeting, posing and performing with stars such as Dr. Dre, Elton John and Beyonce (and even posing as a wax figure, of course, with pink-infatuated Perez Hilton).

What you won't see is Lady Gaga ever being anything less than the most outrageously dressed person in the photo. Even when Cher busts out her old 'Turn Back Time' outfit, Ms. 'Poker Face' turns up in a dress made of actual meat.  Also, good luck catching her in the same outfit at two different occasions.  With her new album 'Born This Way' set for release later this spring, you can be sure even more celebrity meet-ups, which means more photos!