Busty Strictly star Chelsee Healey is a perfect ten

The judges couldn't praise the Waterloo Road actress enough, with Bruno Tonioni telling her he could "feel the continuous, relentless flow of heat, pressure and steam".

A stunned Alesha Dixon added: "Honestly honey, I don't think you realise how good you are."

Even the usually-harsh Craig Revel Horwood called the routine "gob-smackingly good" before awarding a 10 to the stunning actress and partner Pasha Kovalev.

But they faced stiff competition - as rivals Jason Donovan and Kristina Rihanoff also took full marks for their Argentine tango.

The Aussie scored 34 with a Samba to Michael Jackson's Blame It On The Boogie, then upped his game to earn a pefect score with a routine Craig called "incredible."

Popular ... Harry Judd and Aliona Vilani

But McFly heart-thob Harry Judd was snapping at their heels after landing just one point away from a full 40 in BOTH of his numbers.

His partner Aliona Vilani was dressed in a sexy cropped sailor's top while Harry donned a blue number for their Charleston to I'm Just Wild About Harry.

The hunky musician's bandmates were in the audience, cheering on their pal as he took three perfect 10s and a nine.

And they were overjoyed as he landed another 39 for his romantic Viennese Waltz.

Strictly girls Alex Jones and Chelsee Healey hit by boob torment

The top-heavy stars are both suffering severe back pain ahead of tonight's semi-finals.

One Show host Alex, 34, has been prescribed strong painkillers ? and is having daily sessions with a physio.

The BBC wardrobe department are also sewing sports bras into her spangly outfits to support her 34D chest.

Alex's spine is particularly sore after hours practising the bouncy steps of the salsa with partner James Jordan.

A show source said: "Alex has got a gorgeous figure but big boobs do cause back ache. Her back is really bad at the moment. She's been suffering for a few weeks now but she is embarrassed and doesn't want the sympathy vote."

Last week Alex danced through the pain after bruising her ribs when James lifted her.

Back problems ... Chelsee Healey

Actress Chelsee, 23, has been strapped up to ease the pain from her 32DD boobs. The Waterloo Road star wrote on Twitter: "My back is in bits can't walk never mind dance!" She also tweeted: "I'm in agony with it, just need to rest up tonight. Still really sore, got a heat pack on it."

But judge Bruno Tonioli warned there can be no excuses. He said: "Injury or not, you have to go for it.

"It's like doing the marathon ? the last mile is the most important. It's too late for moaning and groaning."

Alex and Chelsee are up against Jason Donovan, Holly Valance and McFly star Harry Judd in tonight's semi-final on BBC1 at 6.30pm.