HANGOVER hunk BRADLEY COOPER seemingly immune to  femme fatale DITA VON TEESE’s boozy allure.

The pair of stars were in trendy Italian eaterie Farfalla in Los Feliz when an witness spied Dita, 40, foaming at the sight of Cooper, 37, reported.

“Bradley completely snubbed Dita when she made a beeline for him,” a eyewitness divulged.

“She was desperate to get his attention, so she asked the waitress to go over to his table and ask him what he wanted to drink.

“Bradley told the waitress he’s on a health kick at the moment and said he was fine.

“After that, Dita was looking over at him, fluttering her eyelids and wanted him to join her and her friend.

 “But Bradley just wasn’t that into her, he ignored her eye contact and just looked down at his phone. He left before she did and didn’t even acknowledge her on the way out of the restaurant. She looked gutted.

“It really was an awkward moment for Dita, I’m sure a lot of men wouldn’t turn her down,” the source postulated.

Back in September, Cooper revealed he’s been sober for 8 years and is said to be back on again with super-ex-GF Zoe Saldana after they were eyeballed leaving the ArcLight Cinema in Hollywood arm-in-arm on Sept. 2.