By Sandra Birungi

26 year old Mary-Kate Olsen might be engaged to 43 year old Olivier Sarkozy.

During the New York Knicks basketball game at Madison Square Garden in New York City on Sunday, the Olsen twin was spotted with a thick, golden band around her ring finger which brought up speculation that she could be engaged to Sarkozy.

Sarkozy last year split from his wife of 13 years, Charlotte Bernand which whom he has two children. They have been dating for nine months and they seem a little bit more serious than anticipated.

The simplicity of the band could as well mean that the two are already married.

Olsen has not yet come out to either confirm or deny the rumors.

Olsen previously dated artist Nate Lowman for more than two years, with that relationship ending in February 2010.