Ellen DeGeneres reveals that the future first lady donned a revealing dress for the high-school dance.

Who doesn't love an election year feud? Ronald Reagan vs. Gerald Ford. Ted Kennedy vs. Jimmy Carter. Sarah Palin vs. Katie Couric. Michelle Obama vs. Ellen DeGeneres. Wait, what?

It seems that the daytime TV host, still smarting from losing a pushup contest against the First Lady in February, decided to retaliate by showing off a photo of young Michelle Robinson dressed for prom. DeGeneres showed the photo as they taped a segment for Monday's show. She did also post her own prom photo, which is perhaps worse (is that a prom dress or something she stole from Marsha Brady's closet?). Still, that's quite a racy dress for the future FLOTUS -- especially the side slit. In fact, Obama said she didn't think she'd let her own daughters wear the dress.

The picture isn't actually new. The Telegraph uncovered it, along with her mustachioed, stony-faced date David Upchurch, in 2009.

Last year, Chris Good dug up yearbook photos for each of the GOP contenders: