The pair were pictured walking through Los Angeles airport last night and seemed rather intimate with one another.
The strapping hunk had his arm wrapped around the X Factor USA judge and despite wearing dark sunglasses both were gazing lovingly at each other.
Another photograph showed Nicole standing close to her rumoured love interest, who looked smitten and was smiling at the brunette beauty.
Both seemed relaxed and happy in each other's company and their body language suggested they could be more than just friends.
Nicole has been single since she split from Formula One driver Lewis Hamilton last year.
The former Pussycat Doll was briefly linked to X Factor USA host Steve Jones, who was said to have comforted her after the break-up.
The 33-year-old was last pictured with Lewis in a Los Angeles car park shortly before Christmas. They were having an awkward-looking conversation, but it sparked rumours they might reconcile.
"We still have very, very strong feelings for each other and I still love her very much. Who knows, maybe we will be together in the future?' Lewis was quoted as saying last month.