Jake Gyllenhaal was spotted kissing Ruth Wilson.
The 'Nightcrawler' star is reported to have enjoyed a "passionate" kiss with the 33-year-old actress after they took a fitness class together at Barry's Bootcamp Noho in New York on Saturday (09.05.15).
The hunky actor, 34, was said to be in "workout mode" as he sipped on a protein shake while he waited for the brunette beauty to exit the changing rooms.
According to the New York Post newspaper's Page Six, he then gave her a "passionate but tasteful kiss" when she emerged.
The news comes just weeks after Jake insisted he was single during a TV interview with host Ellen DeGeneres.
The star was first linked to Ruth - with whom he starred in the Broadway show 'Constellations' earlier this year - in December.
The pair were also said to have been "all over each other" at this year's Golden Globe Awards.
An insider recalled: "Ruth and Jake were all over each other and didn't seem to mind who saw them.
"They were holding hands and shared a little kiss, it was sweet."
Shortly afterwards Ruth gushed over her co-star but insisted she and Jake were more like brother and sister.
She said: "He's adorable, a really good guy. We've become like brother and sister a little bit. We spend so much time together. We trust that even if we have a little [disagreement - which is going to happen because we're in a tense environment that demands a lot from us - we'll make up and we'll be fine. I trust him implicitly."