Superstar Lady GaGa walked up the aisle on Saturday (08Jun13) when she served as maid of honour at her best friend's wedding in Mexico.

The Born This Way hitmaker toned down her usually headline-grabbing style for the intimate ceremony in Cabo San Lucas, donning a pale peach gown and subtle make-up as she watched her school pal Bo O'Conner tie the knot.

Playing the dutiful Maid of Honour, the 27-year old held the bride's white and pink bouquet, as well as her veil throughout the wedding ceremony.

Notably absent was the singer's actor boyfriend, Taylor Kinney, who was busy filming The Other Woman with Cameron Diaz in New York.