Lester Cohen / WireImage.com 1 / 6
Lester Cohen / WireImage.com 1 / 6

R&B star Bruno Mars missed out celebrating his seven Grammy Award nominations onstage in December 2011 after falling ill and scrapping a planned concert.

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The singer/songwriter was unveiled as one of the multiple nominees ahead of the 2011 ceremony, earning recognition in categories such as Song of the Year ("F---You" with Cee-Lo Green), Best Male Pop Vocal Performance ("Just the Way You Are") and Record of the Year (for both "F--- You" and "Nothin' on You" with B.o.B.).

He performed at the nominations concert in Los Angeles on Dec. 1, but couldn't stay to toast his achievements with his peers.

Instead, he boarded a flight to Pittsburgh, Pennsylvania where he was scheduled to play a gig - only to become too sick to perform for his fans.

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He tells MTV show "The Seven," "I actually had to get on a plane and went straight to Pittsburgh and got sick and had to cancel the show for the first time. It was a little bittersweet."

However, Mars plans to make up for the celebratory drinks at the event itself on Feb. 13.

He adds, "Grammy night we'll celebrate."

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