Jennifer Aniston Moving On After Breakup with John Mayer

Jennifer Aniston hasn’t wasted any time moving on from her nasty breakup with ex John Mayer.

Despite the public flogging the beauty took after Mayer sang a spiteful breakup song – “Heartbreak Warfare” – during his Mayercraft cruise, Aniston was all smiles at the David Lynch Foundation's Paul McCartney concert Saturday night.

“She looked really happy,” said one witness. “There was a definite glow to her. She couldn’t stop smiling.”

Which she did often at one lucky fella. “Jen checked out a cute guy walking in. She looked him up and down ... twice!” our source said. “She flashed him a beaming smile but got pulled back into a conversation with her girlfriends.”

Aniston giggled with two gal pals, and appeared excited to be at the charity concert, which raised more than $3 million to teach children how to meditate. She was also excited to see Sir Paul McCartney himself.

“On a stage this size, it’s going to be great. I love him!” Aniston gushed to her chums. The girls talked for a bit about how elated Aniston was to have “free time again. Jen laughed out loud at that, as though it were an inside joke.”

The actress was so engrossed in her conversation, she missed the bar attendant repeatedly asking her what she wanted to drink.

“She was having so much fun. John and their issues seemed like the last thing on her mind,” our spy shared.

That’s no easy task given Mayer’s new, very pointed tune. With lyrics like “If you want more love, why don’t you say so? How come the only way you know how hard to hit me is to see how far I fall?” and “Clouds of sulfur in the air/Bombs are falling everywhere,” the song contains a harsh message, which Mayer’s rep was quick to counter. “The songs are subjective. The listeners are free to interpret and apply them to their own lives,” the rep said.