Lady Gaga channels Marilyn at Clinton fete

Lady Gaga certainly wasn't shy about singing for President Bill Clinton on Saturday night.

During a concert honoring the 10th anniversary of Clinton's foundation and his belated 65th birthday, the pop star playfully flirted with the former president, Politico reports.

"Bill, I'm having my first real Marilyn Monroe moment," Gaga said after crooning "Happy Birthday" to him during her opening number. "I always wanted to have one. And I was hoping that it didn't involve an accident with some pills and a strand of pearls, so here we are."

Clinton -- in the front row at the Hollywood Bowl with his wife, Secretary of State Hillary Rodham Clinton, and daughter, Chelsea -- laughed when Gaga told him, "I wish you were playing sax with me tonight, baby."

Wearing only a beige body suit and heels by the end of the performance, Gaga took off pieces of her outfit as she danced and adapted a few of her hit songs for the occasion.

"So tonight, I just thought we'd all get caught up in a little 'Bill Romance,' " she said before her rendition of "Bad Romance" devoted to the 42nd president. At one point, while gyrating directly in front of the Clinton clan, Gaga quipped, "It's a good thing I used to dance on bars, right?"

The former first family smiled and clapped along, but Clinton later told the crowd (and those who watched the concert live-streamed on Yahoo!) that he was a little worried about the performance. "I got nervous when Gaga said she was planning to have a Marilyn moment. I thought, my God, I get Lady Gaga and I will have a heart attack celebrating my 65th birthday," he joked.

One risqué bit that Clinton may have missed: Gaga did perform the intro to her song "Government Hooker" before exiting the stage. Less hard to miss: She dropped the F-bomb and gave the middle finger in between songs.

Gaga joined a high-powered lineup at the concert that included surprise guest Stevie Wonder (whose first song, "Sir Duke," left Clinton wiping his eyes), Kenny Chesney, Grace Potter, Somali rapper K'naan, Colombian singer Juanes, and Usher (whose pant leg ripped while he was dancing).

Bono and The Edge of U2 closed the concert with a mostly acoustic set that included such tunes as "Desire," "One" and "Sunday Bloody Sunday," which Bono sang directly to Clinton.

The duo -- who were accompanied by a string quartet and Edge's laptop -- closed with "Miss Sarajevo." Bono tackled the operatic part of the tune originally sung by the late Luciano Pavarotti.

Other notables who participated included Ashton Kutcher, Ellen DeGeneres, Laura Ling, Maria Bello and Jason Segel.