Dermot O'Leary is to step in for Sir Terry Wogan on 'Children in Need'.

Dermot O'Leary

Dermot O'Leary

The legendary presenter had to pull out of hosting the annual charity extravaganza due to "health reasons" but the BBC has now announced the former 'X Factor' host is to take his place.

A spokesperson said: "We are pleased to announce that fellow Irishman and Radio 2 presenter Dermot O'Leary will be stepping into Sir Terry Wogan's shoes for tonight's 'Children in Need' from 7.30pm to 10pm, hosting alongside Tess Daly and Fearne Cotton. The presenting baton will be picked up by Shane Richie on BBC Two at 10pm, then return to BBC One with Nick Grimshaw and Rochelle Humes from 10.30pm. We are incredibly grateful to Dermot for stepping in at such short notice but know he'll do us and Sir Terry proud."

The 42-year-old presenter admitted he's thrilled to have been asked to take over as host and sent his well wishes to Sir Terry.

He said: "It's a huge honour to be asked to step into Sir Terry's shoes tonight; he is one of my broadcasting heroes and has been a source of support for me down the years.

"I'd like to add my best wishes to Sir Terry for a speedy recovery, and I hope I do him justice and do my small part to make the night a success and make as much money as we can for disadvantaged children across the country."

'Children in Need' kicks off tonight (13.11.15) at 7.30pm on BBC One.