Adele's underwear only costs £1.

The 'Rolling in the Deep' hitmaker - who is expecting her first child with partner Simon Konecki - is reportedly a ''big fan'' of budget high street chain Primark and particularly likes their ''novelty'' undergarments.

Author Chas Newkey-Burden writes in 'Adele: The Biography': ''She is still the same girl she always has been. For instance, one day after she hit the Big Time she followed a visit to the Louis Vuitton store by going to knockdown-clothes favourite Primark.

''She is a big fan and loves the £1 knickers with all the novelty designs and funny jokes on them. But she knows she can only wear them once because they just fall apart.''

However, the 24-year-old singer - whose album '21' is the biggest-selling record of the 21st century - is more than willing to splash out when buying handbags.

Chas added: ''One of her most expensive models was made by CHANEL and set her back over £2,000.''

Adele is also a big fan of having false nails fitted as they make her feel womanly.

Chas explained: ''She loves acrylic nails. She calls them her ghetto nails and says they make her feel like a woman.''