Jesse James, 43, is in a serious relationship again.

TheAustin-based custom bike and car builder, who was engaged to tattooartist Kat Von D and was married to Sandra Bullock, Karla James andJanine Lindemulder, is now dating racer Alexis DeJoria.

Hollyscoop reports the two are engaged, but neither star has spoken up about it.

Whois Alexis DeJoria? She's daughter of John Paul DeJoria, co-founder ofbillionaire hair care giant Paul Mitchell. "I've always been interestedin a fast-paced lifestyle," DeJoria, 35, who has a daughter, Isabella,9, told the New York Times in a May interview, adding that herfather has always owned Ferraris and Porsches. She now competes in theFunny Car class, typically driving a supercharged Toyota some 300 mph.

RadarOnline reported in October that they two car geeks had been dating since September and that he was "helping her compete."

DeJoria didn't deny the James romance on Twitterwhen a fan said to her: "I used to admire you now I feel sorry for you.Moving in and getting engaged to a guy you've been dating for a month."

DeJoria replied: "Am I supposed to wait till I'm married tosleep with a man too?! Lol! You've been brainwashed into what societysays is right."