Ashlee Simpson Is Engaged

Somewhere, Captain America is crying in his beer. HA! Is it me, or is that a really nasty-looking photo of the happy couple?

Ashlee Simpson, 23 and her rocker boyfriend, Pete Wentz, 28, are tying the knot, Usmagazine.com has confirmed.

A rep for Simpson tells Us, "Yes, they are happily engaged." Earlier today, the singer told Us, "I'm really happy!"

One possible cause for the quickie engagement - a pregnancy, to which her rep had no comment and referred Us to friendsorenemies.com, where Simpson posted the following Wednesday:

"We know there has been a lot of speculation recently about Pete and I, and we wanted our fans to be the first to know, because you guys are the best. Yes, we are thrilled to share that we are happily engaged." (H/T - Yahoo!)

According to published reports, when Pete Wentz popped the question, Ashlee lip-synced the word "Yes." Heh.