Weeks after tying the knot in real life to new husband Ryan Reynolds, the "Gossip Girl" donned another wedding dress on the set of the CW show -- to marry her real-life ex.
Looks like her character, Serena van der Woodsen, ties the knot to sometimes-boyfriend Dan Humphrey (Penn Badgley) in the show's series finale. Of course, Blake and Penn dated for three years before calling it quits in 2010.
Potential awkwardness aside, Blake looked gorgeous in a gold and cream gown from Georges Chakra's Spring 2011 Couture collection.
Former costars Taylor Momsen and Connor Paolo (who play Penn and Blake's on-screen siblings) returned for the big event and were spotted on set as well. Check out those photos in the gallery above.
The Serena & Dan wedding comes one day after Leighton Meester and Ed Westwick's characters appeared to say "I do" in a more low-key (but police interrupted) ceremony.
While Lively looks amazing, we can't wait to see her in her real, Marchesa wedding dress. That won't be revealed until the December issue of Martha Stewart Weddings.