Report: Pregnancy Scare Sparked Halo Breakup

Attractive Heroes co-stars and real-life couple Hayden Panettiere and Milo Ventimiglia announced their split this week, citing a "lifestyle conflict."

Whatever the hell that means.

It could apply to anything, but get this: according to the Chicago Sun-Times, the Halo split was caused by a pregnancy scare a few months ago.

The test was negative and Hayden was spared from joining Bristol Palin and Jamie Lynn Spears atop the list of America's hottest, famous unwed teen moms.

The whole incident apparently caused a great deal friction, and that ultimately sparked the couple's recent breakup, however. No official word on whether the Panettiere love child that wasn't belonged to Milo or Jesse McCartney.

Either way, Halo had a good run.

Click to enlarge some pictures of the newly-single Hayden Panettiere, 19, and Milo Ventimiglia, 31, in happier, non-pregnancy-scare times ...