Their romance is really heating up!

Just days after completing rehab and finalizing his divorce, Ben Affleck took new girlfriend Shauna Sexton on a weekend getaway to Montana. The two spent some time in nature and went fishing in the river, and the Playboy model couldn't help but Instagram a couple snapshots from their trip.

The pinup shared one of the Oscar winner looking out the window as they drove, and she clearly wanted everyone to know they were together. We wonder how Jen Garner feels about this?

There are all types of crazy rumors going around about their relationship these days! The latest? The A-list star is preparing to pop the question!

“Ben’s head over heels in love with Shauna and sees her as definite marriage material. He’s anxious to hurry up and get his divorce finalized so he can marry her and they can start the rest of their lives together," a source told The National Enquirer.

"It's pretty shocking since he's only been dating this girl for a couple months and isn't in the right frame of mind to be settling down with anyone. But Ben's starry eyed about Shauna and insists there's nothing wrong with acting on his instincts. He wants her to be the next Mrs. Affleck as soon as possible. In fact, it wouldn't surprise anyone if he just went ahead and eloped any day now," the source added.

We really didn't think this would last more than a week, but apparently we were wrong. We caught them arriving home at his Pacific Palisades mansion last night, and it seems like they're living together now, too!