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Last Updated: Monday January 31 2011 08:15 GMT

Ke$ha at the top of singles chart

Ke$ha performing

American singer Ke$ha has stormed into the singles charts, knocking Bruno Mars off the top spot, with We R Who We R.

The track, from her double album Animal and Cannibal, is Kesha's first UK number one after her last single Take It Off reached number 15 last August.

It's only a week after Bruno Mars became the first solo male artist to top both the singles and album chart since Mika in 2007.

Husky-voiced British singer Adele's album '21' topped the album charts.