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Well, it's official - she's no longer a girl and he's no longer a Fall Out Boy!

Ashlee Simpson and Pete Wentz walked down the aisle yesterday - despite the scorching heat - at the Simpson Mansion in Encino, with the event being catered by famed chef Wolfgang Puck... congrats to the happy couple!!!

Us reports that 150 guests attended - including Nicole Richie and Joel Madden - and that the ceremony was all gothed out: "black rugs, black chandeliers and lots of red roses." All attendees even wore dark colors at the couple's request and Ash sported a Monique Lhuillier gown! (Guess she didn't decide to follow suit and wear black herself, though!)

We also spotted older sis Jessica's flame Tony Romo arriving to witness the nuptials...

So does this mean that kiss wasn't just a kiss and those two are back together?