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Kate Mara, Jamie Bell, Instagram

Instagram

We were willing to accept Kate Mara and Jamie Bell as "the very best of friends" for a while, but this latest picture is definitely sparking romance rumors once again.

Stylist to the stars Johnny Wujek Instagrammed a group shot of he and his pals, including Mara and Bell, enjoying their time on the beach Monday evening. Sure, it's just your classic friends pic, but what's catching people's eyes is the fact that Mara, 32, is resting her head on 29-year-old Bell's bare chest! These two look awfully cozy...

"Celebrating the Full Moon in Malibu last night w/ this lot of Goof Balls. #ilovemyfriends #crystals&tequila," Wujek captioned the pic.

The twosome seemed to be enjoying themselves, holding onto glasses of white wine while taking in the sunset.

Kate Mara, Jamie Bell

Mark Sagliocco/Getty Images

A source previously told E! News that the Fantastic Four co-stars were just spending a lot of time together because they were busy promoting their film, but this picture will definitely have fans wondering if there is more to it now! Our source even had an explanation for why they looked so PDA-esque at the Met Gala, saying, "He was being a gentleman helping her out of the car and walking in her high heels. Good men do that."

Preach!

Although both haven't commented on the status of their relationship—or lack there of—Bell previously was married to Evan Rachel Wood, with whom he shares a son. Mara, on the other hand, split from Max Minghella last August after four years of dating.

Even if they are just friends, they would make a cute couple!