Holly Willoughby concedes defeat in the battle of the boobs as Kelly Brook appears on This Morning

PUBLISHED: 10:26 EST, 28 February 2013 | UPDATED: 10:42 EST, 28 February 2013

Neither of them are by any means lacking when it comes to the cleavage department.

But Holly Willoughby conceded defeat to Kelly Brook in the battle of the boobs as she appeared on This Morning on Thursday.

The 33-year-old model has joined Holly as a team captain on Celebrity Juice as she fills in for Fearne Cotton during her maternity leave, and the television presenter admitted she is content with playing 'second fiddle' to Kelly's 32E bust.

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Cheeky: Kelly Brook and Keith Lemon joined Phillip and Holly on the This Morning sofa on Thursday

As Kelly and Celebrity Juice host Keith Lemon appeared on the ITV1 show, Phillip Schofield asked: 'Is there any competition in the bosom-age area?'

To which Holly responded: 'I am more than happy to play second fiddle in the boob area because she is amazing.'

The mother-of-two joked that Keith - portrayed by comedian Leigh Francis - had also been devising cunning plans in an attempt to get them to lock lips.

Battle of the boobs: Holly Willoughby joked that she is content with playing 'second fiddle' to Kelly's ample chest on Celebrity Juice

New girl: The 33-year-old model is currently standing in for Fearne Cotton as a Celebrity Juice team captain

Elegant: Kelly looked stylish in a grey lace dress with lemon yellow trim for her daytime television appearance

Holly said: 'He's got this thing in his mind that if he keeps saying I'm jealous of Kelly then I'll prove I'm not jealous by kissing her. This is how his weird little brain works.'

Speaking about one game he planned, which resulted in Kelly kissing a wet fish, Keith added: 'It was a saucy game, we called it Keith's cocktails. It's a cup with a straw in and they have to retrieve the straw with their mouths.'

Meanwhile, the group touched upon Katie Price's recent jibes, in which she labelled size 10 Kelly a 'heffer' in her newspaper column and claimed she had been comfort eating in the wake of her split from rugby player Thom Evans.

Hitting back: Kelly and Keith also discussed Katie Price's recent 'heffer' slurs during their appearance on the ITV1 show

Limited options? Kelly joked that she only took a job on This Morning because she was going through a 'dry spell' in her career

Looking decidedly awkward as Phillip asked her about the cruel taunts, Kelly said: 'There's nothing I want to say, she's given me plenty of ammunition.

'She's educated me because I didn't know what one [a heifer] was.'

After Phillip praised her for her 'elegant, ladylike and dignified' response to the slur, Keith jumped to his new leading lady's defence.

He said: 'She's very fit so she doesn't care if someone calls her a moose. She knows she's fit. You wake up looking like that and you know it's going to be a good day. You are FAF, fit as flip.'

Cheeky questions: Host Phillip Schofield asked Kelly and Holly if there was any competition 'in the bosom area'

Praise: Holly admitted Kelly's 32E bust is 'amazing'

The Kent-born beauty was her typically stunning self for her daytime television appearance, looking effortlessly elegant in a grey lace dress with lemon yellow trim.

Meanwhile, Kelly - who previously starred in Keith Lemon: The Film - joked that she only accepted a job on Celebrity Juice because she was going through a 'dry spell' in her career.

She said: 'Phil, it was a dry spell and there wasn't much going on, what can I say?'

Sleepy head? The Kent-born looked a little weary as she left her London home at 5am on Thursday morning for a busy morning of interviews

It had been a busy morning for the star after she left her London home at 5am for a round of television and radio interviews.

Despite looking a little tired after a late night of filming, the brunette model cut a stylish figure in black cigarette pants, a matching tuxedo jacket and a purple tiger-motif T-shirt, while towering on skyscraper patent peep-toe heels by Christian Louboutin.

Kelly makes her debut on Celebrity Juice on Thursday night's show.