Red hot mother of three!

Jennifer Garner looked super sexy at Thursday's NYC premiere of Butter in a red strapless Gucci dress.

The 40-year-old wife of Ben Affleck -- and mom to daughters Violet, 6, Seraphina, 3, and son Samuel, 7 months -- flaunted her slim, toned bod at AMC Lincoln Square Theater.

PHOTOS: How Ben and Jen fell in love

Garner plays a very type-A mom in the new film, but the actress insists she's nothing like that in real life. 

"I am not like her in any way, shape or form!" she told reporters.

"It was just fun. What was so great about playing this role was getting not to be myself," she added. "I'm sick of myself! I went totally the other way and I had a blast.

PHOTOS: Jennifer's life as supermom

Joining costars Olivia Wilde, Alicia Silverstone, the busy mom hit the after-party for Butter hosted by Appleton Estate Reserve and Cinema Society at The Double Seven.

During a recent interview with Ellen DeGeneres, Garner said she's happy with having three children -- but husband Affleck, 40, would like more!

PHOTOS: A look back at Jennifer's maternity style

"I am not pregnant right now," Garner said on The Ellen DeGeneres Show. "I plan to be done. But my husband is kind of a wonder sperm kind of guy."

"You never don't know," she added. "You just have a look at him!"

This article originally appeared on Jennifer Garner Reveals Toned Arms in Strapless Red Dress at Butter Premiere