Fearne Cotton has given birth to a son named Rex.

The Radio 1 DJ and her boyfriend Jesse Wood welcomed their first child together this morning (21.02.13) and broke the happy news to their fans via Twitter.

First-time mum Fearne, 31, tweeted: ''Jesse and I are over-the-moon to announce the arrival of Rex Rayne Wood born on the 21.2.13.''

Jesse - the son of Rolling Stones rocker Ronnie Wood - already has two children, Arthur and Lola, from his marriage to Tilly Wood.

She added that she is ''beyond in love'' with the new addition to her family.

Her best friend and 'Celebrity Juice' co-star Holly Willoughby was quick to congratulate her pal.

She posted: 'Hooray! @Fearnecotton congratulations on baby Rex!!!!! Can not wait to meet your little man... love you! Xxx' (sic)''

The presenter has been in a relationship with Jesse since 2011 and previously revealed she was blissfully in love with him, admitting he has made her the happiest she's ever been.

She said: ''This time last year, I was probably quite miserable, but Jesse turned that around. I'm content for the first time ever - it's a really good feeling.''