Mandy Moore Joins Jake Gyllenhaal & Jon Hamm at Joni Mitchell's Birthday Celebration!

Mandy Moore stuns on the red carpet as she arrives at the JONI 75: A Birthday Celebration on Wednesday night (November 7) at the Dorothy Chandler Pavilion in Los Angeles.

The 34-year-old This is Us star looked pretty in a cutout, tan dress as she was joined at the event by hunky actors Jake Gyllenhaal and Jon Hamm.

PHOTOS: Check out the latest pics of Mandy Moore

Also stepping out for the event was Tom Hanks and wife Rita Wilson along with Seal.

The event was held to honor singer Joni Mitchell for her 75th birthday.

FYI: Mandy is wearing a Proenza Schouler dress and Malone Souliers shoes.

15+ pictures inside of the stars at the event…