Christina Aguilera has ''hired and fired'' several wedding planners.

The 'Your Body' hitmaker, who has been engaged to fiancé Matt Rutler since February 2014, is reportedly struggling to finalise details for their special day because of her over-the-top ideas and demands.

A source close to the 34-year-old beauty told America's OK! magazine: ''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.''

The 'Voice' USA mentor - who has daughter Summer, 11 months, with Matt and son Max, seven, with ex-husband Jordan Bratman - is also said to have changed her mind about her wedding dress half-way through the fitting process and is now on the hunt for a new gown.

Christina previously admitted she is ''not in a rush to set a date,'' but another source claimed the wedding was on hold as she and Matt, 30, were finding it difficult to iron out a pre-nuptial agreement.

The insider said: ''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.''