They grow up so fast! It seems like only yesterday we were watching Mary-Kate and Ashley on Nickelodeon, and now one of the twins has apparently tied the knot!

Mary-Kate and her banker fiancé Olivier Sarkozy were spotted wearing gold bands on their ring fingers as they ate lunch in the Hamptons recently, a sight which immediately set tongues wagging. 

And a "well-connected source" has now confirmed that the happy couple have indeed made things official. Speaking to Lucky magazine, the insider revealed that the pair got married in a top-secret ceremony sometime over the last few days.

Just a few family members were in attendance at the hush-hush wedding, it has been reported. MK and Olivier's reps have yet to confirm or deny the news, but those gold rings look like a pretty sure sign to us!

The couple, who share a townhouse in New York, got engaged back in March after almost two and a half years together. 

Although they did receive some heat at the beginning of their relationship for their 17 year age gap, it seems older men are somewhat of an Olsen tradition. Ashley's currently dating director Bennett Miller who is 19 years her senior.

If 27-year-old Mary-Kate did indeed marry her sweetheart, she'll also become stepmother to his two children, aged 14 and 11, from a previous marriage.

Congrats to the happy couple!