They've been rumored to be having relationship issues, but Christina Aguilera proved that the wedding is still very much on as she dedicated a song to fiance Matt Rutler during a recent fundraising concert.

The coach of "The Voice" headlined the recent concert at The Creeks, owned by billionaire Ron Perelman, which was also attended by Jack Nicholson, US presidential bet Chris Christie, Mary Kate-Olsen and comedian Jimmy Fallon.

"During the performance, Aguilera decided to give a special shout out to her man as they prepared to mark their baby girl Summer Rain's birthday," the Business-Standard said.

She then belted her own version of Etta James' classic, "At Last."

Matt Rutler and Christina Aguilera's wedding was reported to be in danger as "The Voice" coach has become quite the bridezilla, claimed OK! magazine.

The insider claimed, "Several wedding coordinators have been hired and fired." "Matt's family has also offered to help, but every suggestion is shot down. It's her way or the highway."

Christina Aguilera and Matt Rutler have been engaged for about a year now after the mother-of-two confirmed their engagement back in February 2014. They have one child together, Summer Rain. She also has another child from a previous relationship, Max.

Previously, it was reported that the couple's wedding might not even push through because of the prenup.

OK! magazine reported that Christina Aguilera already had her lawyer draw up a prenup agreement.

"Christina's lawyers wrote the agreement so that he gets almost nothing if they split. The prenup caused a lot of problems for them. Matt has no financial power, and she never lets him forget that," the article claimed.

Meanwhile, Christina Aguilera and fiance Matt Rutler celebrated the first birthday of their daughter, Summer Rain.

The coach of "The Voice" shared on Instagram a photo of her daughter holding a pink balloon with the words, "Happy 1st Birthday! My Sweet, Summer Rain."