The burlesque dancer was seen making eyes at 'The Hangover' actor at Farfalla restaurant in Los Angeles and tried to buy a drink for the handsome star, but he remained immune to her advances and left without saying goodbye.
An onlooker said: ''Bradley completely snubbed Dita when she made a beeline for him. 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.''
The sexy star - who was famously married to Marilyn Mason - appeared shocked by the actor's rejection of her drink offer, even though Bradley has now been sober for eight years.
The source added to RadarOnline: ''She looked gutted. It really was an awkward moment for Dita, I'm sure a lot of men wouldn't turn her down.''
Bradley is said to have rekindled his relationship with Zoe Saldana after their romance initially fizzled out in March.
Meanwhile, Dita recently revealed she is enjoying the single lifestyle and is currently dating several men.
She said: ''I'm single and loving the freedom of being single and dating. It's an exciting time. I've been in a lot of big relationships and I haven't spent much time being single so I figured it's a great time to be free and be without commitment.''