Jack Whitehall

Dance sensation Diversity puts a spring in the steps of Chatty Man Alan Carr, national charmer Miranda Hart and Idiot Abroad Warwick Davis, who've rashly decided to shake a leg - Ashley Banjo-style - as their contribution to this evening of fundraising action for Great Ormond Street Hospital Charity for children. Other funny faces putting their happy feet forward for the cause include comedian Kevin Bridges, who takes a pop at the more furtive pursuits of his fellow Scots, and TV regulars Russell Brand, Jack Dee, Jo Brand, Rich Hall and Paddy McGuinness. Among those putting in an appearance on VT are surreal loon Noel Fielding and Jack Whitehall.

The raucous annual stand-up bonanza in aid of Great Ormond Street Hospital comes once again from the O2 in London.

When the live gig was held a couple of weeks ago, one critic described it as "Live at the Apollo on steroids". In other words, expect big, booming, arena-style stand-up from an all-star roster. Jack Whitehall, Jack Dee, Jo Brand, Noel Fielding and Jason Byrne are among the long list of comics donating gags to the cause.

Diversity open the show with a dance routine into which Alan Carr, Miranda Hart and Warwick Davis insert unexpected cameos. Lee Evans airs a routine about EasyJet. Russell Brand goes walkabout among the crowd. Rich Hall jokes about child labour ("Clothes make the man but kids make the clothes").

And unsurprisingly the recurring theme is the year's revelations about Jimmy Savile and other stars - everyone has an angle on that one.

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Ricky Gervais reviving The Office's David Brent, Miranda Hart giving Call The Midwife a baby comedy makeover, Jessie J shaving her head and Peter Kay in physical challenge and pop promo mode promise to be among the highlights as Comic Relief bigs up its 25th birthday. So if clamping a red nose on your hooter doesn't tickle your fancy, just settle back and raise a glass and a chortle as a raft of hosts, including Rob Brydon, Jack Whitehall and Russell Brand, tackle such dubious tasks as introducing Simon Cowell's wedding video. Someone's having a laugh with that one, surely.

I managed to get an exclusive sneak preview of what Jessie J might look like once she's had her head shaved tonight. It's not great, to be honest.

What I did is, I put Jessie's photo into the hugely amusing Bald Booth app on my iPhone, which magically shows you what anyone will look like as a slaphead. And a few seconds later - hey presto! - there she was, smooth as a pickled egg.

Well, almost. The snag is, this ingenious app doesn't actually erase the hair on either side of a person's head, just on top, so Jessie ends up looking more like my Uncle Norman.

I can't imagine that's the look she'll be hoping for tonight. Having said that, you don't catch my Uncle Norman complaining.

As for the other highlights of tonight's marathon, they include Ricky Gervais returning as David Brent, Jack Whitehall going head-to-head with Micky Flanagan in a special MasterChef, Simon Cowell getting married, sort of, and One Direction treating us to their offcial Comic Relief single, Pledge Fifty Quid And You're Allowed To Give Each Of Us A Good Slap. To donate, call 03457 910910.

That's Jessie J under the swirl of shaving foam, and the reason she's posing like the queen of the Oompa Loompas is that she'll be shaving her hair off as part of tonight's culmination to Red Nose Day. Yes, it's time for the stunts and dares and unlikely comedy mash-ups to reach their bubbling live climax.

As ever, we can expect unmissable moments delivered by an almost obscenely starry line-up. Presenters include Michael McIntyre, Rob Brydon, John Bishop, Davina McCall, Jonathan Ross and (careful, now...) Russell Brand. Ricky Gervais will bring David Brent out of retirement. There are mini-eps of Call the Midwife and Fresh Meat, a cook-off between Jack Whitehall and Micky Flanagan, and of course a new novelty pop promo from Peter Kay.

The trick for viewers is to flash the cash early. Text the donation line or get out the credit card at an early stage, then relax as the night rolls by. You'll never make it through all those heartbreaking appeal films if you don't know your money's on its way.

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