Two days before she was biking around New York with husband Russell Brand as they celebrated their first wedding anniversary

But busy superstar Katy Perry was back to her glamorous self last night after jetting back to the UK to continue her California Dreams tour.

Known for her colourful costumes, the wacky singer donned a Christmas-inspired leotard, complete with baubles.

Hear me roar! Katy Perry donned this Christmas-inspired leotard, complete with baubles, as she performed in Belfast last night

The white number, with pink, yellow and blue attachments, showed off her toned legs as she wowed the crowd at Belfast’s Odyssey Arena.

She covered her dyed pink hair with blue and black wigs.

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Perhaps Katy was showing her inner child on the eve of her birthday.

She turned 27 today and is celebrating with a rare day off before getting straight back into her tour with a concert performance in Birmingham tomorrow, a show in Newcastle on Thursday and one in Manchester on Monday.

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Child at heart: Katy, who is celebrating her 27th birthday today, donned a blue wig and showed off her toned legs in the bodysuit

Peacock power: In another leotard, Katy added feathers to her back, making her look like a giant bird

The rest of October and November are also filled with shows around the UK and Ireland before performances back in the U.S.

In one of several costume changes last night, Katy donned another leotard, this time in green and blue hues with an array of feathers strapped to her back to make her look like a peacock.

And ever the show queen, Katy donned a revealing gold two piece as a string of gingerbread men figurines maneuvered behind her and her back-up dancers lifted her up.

Candy store: In one of several costume changes, Katy, surrounded by gingerbread men, donned a revealing gold two piece as her dances lifted her up

She put on a good show! Katy is surrounded by her dancers holding feathers formed in a heart shape

Later, she went for a more demure look in a maxi-dress with red and brown patterns, no doubt made to look like candy like the theme for the show.

Katy’s birthday is one of several milestones Katy has celebrated over the past week.

On Sunday she celebrated her first wedding anniversary with actor husband Russell Brand.

Lucky boy! The superstar hugged excited fans that she pulled on stage

Say cheese! Katy posed for pH๏τos with a female fan in front of the crowd of thousands

The day before they were spotted biking around in the Bohemian neighbourhood of TriBeca, New York, near their $2.7million apartment.

They then spent alone time watching U.S. documentary Forks Over Knives.

Katy tweeted: ‘Me & the Mr. just watched “Forks Over Knives” it’s a pretty cool doc for anyone interested 🙂 You can get it on Netflix!’

California girls are unforgettable: In yet another change, Katy went for a more demure look with this maxi-dress

The couple married on October 23, 2010 in a traditional Hindu ceremony near the Ranthambhore tiger sanctuary in Rajasthan, India, where Brand had proposed.

They initially met in the summer of 2009 when Perry filmed a cameo appearance for Brand’s film Get Him to the Greek.

But it wasn’t until that September at the MTV Video Music Awards that they got together.

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On your bike: On Saturday, Katy and her husband Russell Brand were seen biking around their New York neighbourhood of TriBeca, as they spent time together on the eve of their first wedding anniversary