Evan Ross Is Calling Ashlee Simpson ‘The One’

Ashlee Simpson's boyfriend is one smitten kitten.

The former pop star and her hunky actor beau, Evan Ross, hit the red carpet in style at Monday night's premiere of "The Hunger Games: Catching Fire" premiere looking happy and ready to gush about it.

And gush they did. When "omg! Insider" asked how things were going, Diana Ross's 25-year-old son confessed, "Yeah, she's the one," adding that he can "foresee" wedding bells in their future.

Whoa. The two reportedly started dating back in June, making their debut as a couple in July at the launch of Ashlee’s older sister Jessica’s Fall 2013 collection.

The actor, who scored a role in the upcoming "Hunger Games: Mockingjay Parts 1 and 2," continued expressing his affection for Bronx Wentz's mom, saying, "It’s amazing. I’m so in love and we’ve got amazing things going on. And we inspire each other.”

Ashlee previously dated "Boardwalk Empire" star Vincent Piazza and was married to "Fall Out Boy's" Pete Wentz, who is the father of her 5-year-old son Bronx, but could Evan finally be her happily ever after?

More importantly, is a double Simpson wedding -- with older sister Jessica and her fiancé Eric Johnson -- in the future?

Check out the video to hear more on this story, and be sure to tune in to “omg! Insider” on TV tonight for more action from the "Hunger Games" red carpet.