Blake Lively and Penn Badgley
10/17/2012 at 11:00 AM EDT
Art imitates life!
's been photographed in a wedding dress … but it's not the Marchesa gown she wore to wed Ryan Reynolds
during their super secret ceremony
The newlywed, 25, was snapped donning a gold and cream Georges Chakra Couture strapless gown on the set of Gossip Girl
on Tuesday, as she stood opposite costar Penn Badgley
Lively's real life wedding dress will be revealed in a photo package in the December issue
of Martha Stewart Weddings
, as the event planning powerhouse herself was behind the affair
"[It was a] charming, charming wedding," Stewart said
"Real people, real love. Just really nice [and] personal, which I think is what a wedding must and should be," she added.