The 28-year-old tied the knot in an intimate ceremony in Faro, Portugal.
UFC star Cathal Pendred and model girlfriend Michelle McGrath were among guests, while O'Malley's former teammate Cian Healy was a groomsman.
Leinster rugby player Dominic Ryan was also in attendance.
“What a magical day! So happy waking up this morning as Lara O’Malley!” wrote the newly wed bride on Instagram alongside a photo of the happy couple.
The bride opted for a classic gown with a lace neckline, while the groom wore a navy suit.
Bridesmaids were dressed in blush pink and the groomsmen in navy.
O’Malley was forced to retire from rugby at the age of 25 following a debilitating knee injury, and has gone on to new open new bar The Jar on Wexford Street.