Charlize Theron & Sean Penn Headed Down the Aisle Already?

Charlize Theron goes incognito as she hops out of her car and heads to work out at her gym on Saturday afternoon (May 31) in West Hollywood, Calif.

The 38-year-old actress and her boyfriend Sean Penn are reportedly getting very serious about their relationship.

PHOTOS: Check out the latest pics of Charlize Theron

“They absolutely want to get married,” a source told Us Weekly, with another source added, “They want to grow their family.”

The day before, Charlize sat down for an appearance on The Graham Norton Show to promote her new movie A Million Ways to Die in the West in London, England.

FYI: Charlize is wearing a Bag Junkies tee.

15+ pictures inside of Charlie Theron getting her fitness on…