He later asks Olive to pretend to sleep with him so that he will be accepted by everyone as a "straight stud".
Brandon convinces Olive to help him and they pretend to have sex at a party.
"Maybe Blake after we broke up," Badgley said with a smirk.
He and Lively, 27, were romantically entwined off-camera from 2007 to 2010, a time period which overlapped with an on-screen romance between their characters Dan Humphrey and Serena van der Woodsen.
After their relationship ended, Lively briefly dated Leonardo Di Caprio before she met the love of her life Ryan Reynolds, whom she secretly wed in September 2012.
Olive Penderghast, a 17-year-old girl living in Ojai, California, lies to her best friend Rhiannon Abernathy about going on a date in order to get out of camping with Rhiannon's hippie parents.
Instead, she hangs around the house all weekend listening to Natasha Bedingfield's "Pocketful of Sunshine", which is played by a greeting card she was sent by her grandfather.