Happy birthday to both John Rambo and Rocky Balboa, as the '80s action icon Sylvester Stallone celebrates his 63rd. He just finished filming next year's flick The Expendables, which he wrote, directed and stars in with fellow action heroes Jet Li, Jason Statham, Mickey Rourke, Dolph Lundgren and "Stone Cold" Steve Austin. Fresh off the July 4 holiday, former commander-in chief George W. Bush is 63. Interestingly, our former president shares his birthday with the Dalai Lama, turning 74, and a first lady, Nancy Reagan, who is 88 today. Rapper 50 Cent will probably be partying on his 34rd birthday. The G-Unit mogul is set to release his next album, Before I Self Destruct, this fall. And actor Geoffrey Rush is 52. He's one of only 20 people ever to have won an Oscar, an Emmy and a Tony.

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