Matt Rutler and Christina Aguilera
09/19/2011 AT 10:00 AM EDT
and boyfriend Matt Rutler
had a ringside view as they watched Floyd Mayweather Jr.
knock out Victor Ortiz
at Las Vegas's MGM Grand. The couple sat near True Blood
's Stephen Moyer
and wife Anna Paquin
, as well as Mark Wahlberg
. Following the fight, Aguilera and Rutler headed to Tao Las Vegas
for dinner and dancing.