Jen Aniston Sings “Happy Birthday” to Courteney Cox at 45th Bash

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 Lester Cohen/

Happy birthday, indeed.

Jennifer Aniston helped BFF Courteney Cox celebrate her 45th birthday Tuesday night at Bouchon Beverly Hills. Also at the fete: pal Laura Dern and four other pals, a source tells

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Unlike the Cobb salad Cox and Aniston dined on every day for 10 years while taping Friends, the birthday girl chowed down on steak. Both she and Aniston — who was dressed down in jeans, a loose brown tank top and a beaded necklace — drank red wine, the insider tells Us.

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"The group sang happy birthday to Courteney and they cheers-ed a few times," says the source. "They all seemed to be laughing and having a great time."

Aniston even put up with an overzealous fan who "grabbed her pretty obnoxiously," the source notes. "[The fan] asked her to take a picture with her. Jennifer kindly took the picture though everyone couldn't believe how she grabbed her. But Jennifer was very sweet about it."

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The group wrapped up with dessert around 10:45 p.m.

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