The 24-year-old Gossip Girl actress wore a floor-sweeping Marc Jacobs gown and clutch, Cathy Waterman jewels and Georgina Goodman shoes. (Leighton was super late because her movie The Oranges wrapped late that night.)
“Leighton and Sebastian are definitely still together,” a source exclusively tells JustJared.com. “They were making out in car parked outside the Mark Hotel but only Sebastian got out to attend the after-party, where N.E.R.D. killed their performance!”
Leight and Seb later met up at the 18th floor of The Standard Hotel, but left separately.