New couple alert: is Captain America dating an Olsen sister?

Have Chris Evans and Elizabeth Olsen been secretly dating for months?

A new report claims that the Avengers co-stars have been keeping their relationship under wraps for at least a few months.

The pair first met when they played Captain American and Scarlet Witch alongside each other in the latest instalment of the Avengers franchise, Avengers: Age of Ultron.

An insider told The National Enquirer that “Chris and Lizzie are definitely involved in some kind of ultra-secret romance that’s being kept under wraps while they shoot.”

“The attraction between them has been there from day one,” the source revealed.

While news of their romance has begun to surface, it may be a while yet before we see any PDA snaps. According to reports, the 34-year-old Fantastic Four actor wants to keep his womanizing reputation at bay.

Mr Evans split from former on/off again girlfriend Minka Kelly in 2013 and has since been spotted with a number of Hollywood women, including Lily Collins. According to reports Ms Collins’ friends warned her to stay away from the actor because of his notorious heart-breaking reputation.

The source explained that “Chris is paranoid about his womanizing becoming public while he’s on this multi-picture deal with Marvel. He’s protecting his image, and will bend over backwards to keep things quiet.”

Before reports of this new romance surfaced, the 26-year-old sister of Mary-Kate and Ashley was rumoured to be dating ANOTHER Avengers star, Tom Hiddleston.

Forget the next film – it looks like Ms Olsen may be the cause for the Avengers next battle!