Justin Timberlake Hooking Up With Ashley Olsen?

Mila, Olivia and now Ashley. You laughed at him in 'N Sync, but Justin Timberlake has managed to become one of Hollywood's most sought after bachelors. I guess those fedoras are working.

Timberlake hung out with Ashley Olsen at the SNL afterparty, but then again, he was also hanging out with Oliva Wilde at the same party. But a source told Us: "They are hooking up."

The pair was also seen together at two Broadway shows and a polo match. Both of them ended long-term relationships a few months ago.

Added the source,"They're really trying to keep it on the down-low."

Timberlake's rep denies a relationship, saying: "They are friends. They are not romantically involved."

But a friend of Olsen's told said that Olsen is "aware of Justin's reputation with women, but…They're in the same head space."

Too bad Justin's in the same "head space" with half the women in Hollywood.

In the July issue of Vanity Fair, Timberlake says Biel is "single-handedly the most significant person" in his life.

He added, "In my 30 years, she is the most special person, okay?...I don't want to say much more, because I have to protect things that are dear to me. For instance, her."