Is the Biebs ready to be a one woman man?

Justin Bieber and on-again girlfriend Selena Gomez are taking their relationship so seriously this time around that they recently swapped rings and have been discussing marriage!

"They held a secret commitment ceremony in LA and exchanged Cartier promise rings!” a source tells Life & Style. That sounds sweet, but knowing him, JB will kick her to the curb for a random chick in about a week, unless he's actually considering making it truly official. "Justin has wanted to take Selena back to his native Canada and marry her," the source adds.

We will have to wait and see how this turns out for these lovebirds!