Singer Joe Jonas and model Gigi Hadid are one celebrity couple rumored to be on the fast track to marriage.

The "Just in Love" crooner plans to propose to the blonde beauty during the Christmas holiday, reports Hollywood Life.

"He wants to make things more official with Gigi and has been telling friends that he would like to get engaged to her around Christmas," an insider tells Hollywood Life. "He is definitely in the planning stages to do something very romantic for the big moment. He is in no rush to get married, but he is in a rush to make her know that she is the one."

Jonas, 26, and Hadid, 20, reportedly started dating shortly after she broke off her relationship with Cody Simpson in May 2015; however, tabloid photographs of the pair surfaced in September 2014. The couple, who have been nearly inseparable since May, initially denied rumors that they were dating.

If a holiday engagement is planned, their relationship is definitely evolving quickly.

An insider close to the couple told Hollywood Life that Jonas is ready to not only settle down, but have children.

"Joe has been telling friends that he wants Gigi to be the mother of his children," the insider said. "He really is convinced she is the one. He is head over heels and hasn't loved someone more. She is it for him."

The celebrity couple was spotted at Cryohealthcare in Los Angeles this week, which is a facility that offers vitamin shots and other health treatments, reports New York Daily News.

"They were sitting on a couch in the waiting area for a good five minutes when I got there," a source from the facility said. "They were really affectionate. Joe was slumped on the couch and Gigi was playing with his hair. They were talking and looked happy, relaxed and super comfortable with each other."

The former Jonas Brothers singer has had many high-profile relationships with celebrities like Demi Lovato, Ashley Greene, Blanda Eggenschwiler, Camilla Belle and Taylor Swift, who is a close friend of Hadid. Hadid even starred in Swift's recent "Bad Blood" music video.

Could the gorgeous young model be the woman he's ready to settle down with?