Bradley Cooper has been rumored to be dating model Suki Waterhouse but the Hollywood playboy is slowly gaining the title as a serial dater.

The 38-year old actor has been romantically linked to the 20-year old model for the past few months but new rumors have surfaced that "The Hangover" star is dating a mystery woman named Alex.

The International Business Times reported that the actor was spotted on Sunday night arriving to the Washington, D.C. Tombs restaurant and saloon in Georgetown.

Accompanying Cooper was the mystery woman, who has only been identified as "Alex."

Witnesses claimed that the pair sat in a corner and enjoyed each other's company, not to mention that they reportedly left a big tip.

The actor was said to be in town after spending the day at the National Conference on Mental Health at the White House in honor of his role playing a man who suffers from bipolar in the film "Silver Linings Playbook."

According to the IBT, back in April, Cooper was spotted with British model Suki Waterhouse. The rumored couple was seen strolling the streets of Paris and enjoying a romantic dinner.

The outing followed about six weeks after the two attended the Elle Style Awards together in February.

It is reported that the "couple" has put their relationship on hold while Cooper promotes his new flick "The Hangover 3."

But according to a source the actor talks to his model fling often, "Bradley has been texting Suki every day since they met."

"He wants her to come to Los Angeles and visit him. He's intrigued by her and she's very interested in him."

Cooper previously dated "Star Trek" beauty Zoe Saladana, in an interview following the split the actress said she would never date a celebrity again.

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