Hayden Panettiere: Single and Sexy at Guy's

Taking a girl’s night out after breaking up with boyfriend Milo Ventimiglia, Hayden Panettiere was spotted out partying at Guy’s nightlclub in Hollywood on Thursday (February 19).

Looking glamorous in a short, strapless, white-wrap dress with her hair pulled back, the "Heores" hottie joined a star-studded guest list for the night's festivities.

In related news, there have been rumors going around dealing with the recent breakup between Hayden and her former "Heores" co-star lover.

A source said, “It was a lifestyle conflict..(She) is young. She likes to go out in the Hollywood scene and that’s not his style. [Ventimiglia] has been concentrating on work, on his production company.”

However, the Chicago Sun Times tells a different story, alleging, “The split between Hayden Panettiere and Milo Ventimiglia was caused by a pregnancy scare. The test proved negative but apparently caused friction that sparked the breakup.”

As could be expected, reps for both parties are keeping mum on the issue.

Gossip Girls / Dailyfill.com

Enjoy the pictures of Hayden Panettiere out at Guy's Nightclub (February 19).