However, if the rumours are to be believed, Demi is currently dating her youngest beau yet, former Jonas Brothers band member and Disney darling, 25-year-old Nick Jonas.
According to reports in RadarOnline, the Striptease actress is "hooking up" with the singer after her daughter, Rumer Willis, brought the unlikely pair together.
"Rumer knows Demi is attracted to younger guys, and she figured that since Nick is single and has experience with older women, he'd be up for a love connection," a source revealed to the publication.
"They hit it off — and now Demi and Nick are hooking up."
The source also spilled the couple have been holding their secret rendezvous at a friend's downtown LA apartment because Demi wants to keep the relationship hush-hush.
"Demi doesn't want any more public humiliations after getting dumped by Ashton," they said.
Despite the fact Nick is younger than Demi's daughters Rumer, 29, and Scout, 26, and just two years older than youngest Tallulah, 23, the unlikely pair may actually make a perfect match, with Nick having a history of dating older women. The Jealous singer has previously dated Aussie sweetheart Delta Goodrem, 33, and Kate Hudson, 38.
Furthermore, the insider revealed although Nick is Demi's "youngest man yet" he's also "the most mature guy she's ever been with."
Perhaps Nick is proof that age is just a number.