Britney Spears felt confident modelling her new underwear line thanks to her ''gruelling'' Las Vegas residency.

The 'Toxic' hitmaker - who performs her 'Piece Of Me' show three nights a week at the AXIS Theatre in Planet Hollywood - has revealed the energetic dance routines featured in the production help her maintain her slim physique and was more than happy to show off her figure on the shoot for her 'The Intimate Britney Spears Collection'.

She tells Glenda Gilson on tonight's (29.09.14) episode of Xposé: ''Yeah, it's fun. It's a hard show, it's really gruelling but it's fun and I enjoy doing it three nights a week so it's like my second home now.''

The 32-year-old singer - who unveiled her new line at the Cafe Royal Hotel in London last week - admitted the vintage-inspired collection has been in the pipeline for a while and was keen to get involved in all aspects of the design process.

She said: ''The fabrics to the prints, the details, the shapes, the sizes, everything. It's something I've wanted to do for a really long time now. I'm a huge fan of lingerie, I love La Perla, I love Victoria's Secret and I love vintage pieces. And because of that it's something I've wanted to do for a while now and create my own vintage pieces, and that's what I've done with 'The Intimate Britney Spears collection'.''

To catch the full interview, tune in to Xposé from 6pm tonight (29.09.14) on TV3.