gym spin sunglasses Studio City Kirsten Dunst Isla Fisher It's always better to work on your fitness with a friend!

Isla Fisher and Kirsten Dunst headed to a gym session in Studio City together yesterday, and we didn't know the actresses were such good pals!

The ravishing redhead is known for being everyone from Jen Aniston to Reese Witherspoon's bestie, so it doesn't surprise us that another starlet has come under her spell!

They should invite Kim Kardashian to join their exercise group!