The couple wed in the Bahamas in 2008 and staged a second ceremony last year (09) to mark their first anniversary as man and wife.
They plan on following in the footsteps of Seal and his supermodel wife Heidi Klum and do it all again every 30 April - but Cannon admits he will be out of pocket trying to top each sparkler.
He tells UsMagazine.com, "We get married every year! That's our thing. So it's going to be our third wedding this year. That's what we'll be doing on the actual (anniversary)... We'll do something, a party or event, just to celebrate.
"This is the third ring I have to buy... It’ll be something different. Something good."