Blake Lively wears corset 4 months after giving birth: 'I gotta get this …

Blake Lively wore a gorgeous off-the-shoulder, velvet gown to the premiere of her new movie, “The Rhythm Section,” on Monday night.

Lively was joined on the red carpet with her costars, Barbara Broccoli, Mark Burnell, Reed Morano, Jude Law and Raza Jaffrey.

Jamie McCarthy / Getty ImagesLively has always been a trendsetter, but early in her career, she didn’t exactly have designers clamoring to dress her for the red carpet.

The “Gossip Girl” star once told InStyle she had turned to fast-fashion chain Forever 21 for some of her early red carpet looks.

In the years since, Lively has made a name for herself on the big screen and red carpet.