Leslie Mann & Lena Dunham: 'This Is 40' Premiere!

Leslie Mann hits the red carpet at the premiere of her film This Is 40 on Wednesday (December 12) at Grauman’s Chinese Theatre in Hollywood.

The 40-year-old actress wore a Vionnet dress, Vhernier jewelry, Christian Louboutin shoes, and a Judith Leiber clutch.

Lena Dunham and Aubrey Plaza stepped out together on the red carpet to support their pals in the flick.

Also pictured: Jason Segel, who reprises his Knocked Up role in the film.

Make sure to catch This Is 40 in theaters on December 21.

20+ pictures inside of Leslie Mann and others at the This Is 40 premiere…