Justin Bieber and Selena Gomez have sparked rumours that their romance is definitely back on again, after they were spotted hopping onto a jet together in California.

The pair, who have remained tight-lipped about their relationship since their alleged split in November, were photographed as they made their way onto a private aircraft in Van Nuys, reported E! News.

They tried to keep a low profile with Selena running towards the jet wearing an oversized green coat, while the Canadian pop star wore a checked shirt and a white cap.

According to a source, the pair will spend Christmas together.

Justin and Selena were recently seen hand-in-hand backstage together before he closed the show at KIIS-FM's Jingle Ball in Los Angeles.

The Boyfriend singer, whose life story is being developed as a US comedy, also visited the former Wizards Of Waverly Place star on the set of her upcoming comedy Behaving Badly.