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Mighty Boosh comic Noel Fielding and former GMTV host Penny Smith are among the stars who will take part in this year's Let's Dance for Comic Relief.

The Thick of It star Rebecca Front and comics Russell Kane and Ed Byrne will also appear on the show, which sees stars tackle famous dance routines.

TV designers Colin McAllister and Justin Ryan have also signed up for the first episode.

The new series will run over three weeks, beginning on 19 February.

The One Show presenter Alex Jones will join Steve Jones to host, replacing Claudia Winkleman.

"I was a huge fan of Let's Dance last year and can't wait to join Steve and the team," Alex Jones said.

"It's come at the perfect time for me having just returned from filming in Africa for Comic Relief where I saw first hand how we can really make a difference."

Let's Dance will see a mix of solo dancers, duos and groups master the dance moves from famous routines.

These will include Beyonce's Crazy In Love, I Love to Boogie from the musical Billy Elliot and Michael Jackson's Bad.

Stars will compete for a place in the grand final during the fourth week of the competition.

Comedian Rufus Hound won last year's show with his homage to Cheryl Cole's hit Fight for this Love.