Bubba's got friends in high places! Music superstars Usher and Lady Gaga, Colombian singer Juanes and rock legends U2 are just some of the artists performing for Bill Clinton at "A Decade of Difference: A Concert Celebrating 10 Years of the William J. Clinton Foundation" in Los Angeles tonight.

The charitable foundation, founded by the former president after he left office, has raised hundreds of millions of dollars over the years and is supported by power players from entertainment, politics and business. 

But despite all the old money and silver hair in the room, count on Bill Clinton to keep things hip. The retired politician, who himself is no stranger to either performing or controversy, gave a shout out to his favorite artist, Lady Gaga, on David Letterman Wednesday night. "She is the most talented person though — even if you're an old fogey like me," he joked.

Let's hope Gaga will return the favor to converted-vegan Clinton by leaving her meat dress on the hanger.

(Photo: Mario Tama/Getty Images)