He's at it again!

Photographers caught the star of "Two and a Half Men," Charlie Sheen, entering and leaving the home of $3,000 an hour call girl, Angelina Tracy, last week while he was supposed to be attending a rehab clinic to get his life back on the straight and narrow.

In Touch magazine this week printed photos of Sheen, dressed in a hooded sweatshirt, dark glasses and a fake mustache, sneaking into Tracy's apartment in Studio City, L.A. He arrived about 3 p.m. on April 7 and stayed about an hour.

“He literally ran to his car,” a witness told In Touch magazine.

“It seemed like he wanted to leave as fast as possible.”

Looks like Sheen is going back to his old ways. He has admitted in the past he had relations with several call girls but swore to his wife Brooke Mueller that he is recently a changed man.

He agreed to attend a rehab clinic in Malibu to get himself back on track.

Sheen, 44, recently leaked to the press that he is quitting "Two and a Half Men.

Tracy, also a lingerie model, works under the name "Nina."

Although there has been no proof that the pair have been intimate, even for money, witnesses tell In Touch that they have seen Tracy drive up to Sheen's mansion while Brooke was away.

On another occasion witness' say they saw Tracy hoping into the back to Sheen's chauffeur-driven Mercedes.

“Charlie had a bouquet of flowers waiting for her and her face lit up,” says the witness. “You could see them kissing.”

“He is seeing Brooke and the kids a lot and is good about continuing treatment,” says a friend defending the rumors.

“And he’s promised Brooke that he’s really changed.”