Usher, Tameka Foster

Usher canceled a pre-Grammys performance to rush to his ailing wife's side after she experienced complications from plastic surgery.

The R&B singer was due to perform at Clive Davis' annual Grammy party, but nixed his appearance to fly to Brazil, where his wife, Tameka Foster, had undergone a procedure, Access Hollywood reports. Usher was accompanied by Dr. Gabriel Hunt, a neurosurgeon at Los Angeles' Cedars-Sinai Medical Center.

Josh Groban subbed for Usher at the event.

Usher and Foster, a former hairstylist for the star, have been married since August 2007. They have two sons, 1-year-old Usher Raymond V, and 2-month-old Naviyd Ely.