Made In Chelsea"s Spencer Matthews and Louise Thompson put on a very amorous display in new trailer

It's back on! Spencer Matthews and Louise Thompson put on a VERY amorous display in trailer for Made In Chelsea series four

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UPDATED:

19:50 GMT, 25 September 2012

Their rollercoaster relationship has been off and on again more times than Jamie Laing has uttered his catchphrase 'waaah'.

But it would seem Spencer Matthews and Louise Thompson are well and truly smitten once again.

In a new teaser trailer for the upcoming fourth series of the E4 reality show, the couple seem to be utterly loved up.

It's back on: Louise Thompson and Spencer Matthews seemed to have rekindled their relationship in a teaser for the forthcoming series of Made In Chelsea

It's back on: Louise Thompson and Spencer Matthews seemed to have rekindled their relationship in a teaser for the forthcoming series of Made In Chelsea

Careering around on a carousel, Spencer –
who failed to find love on Channel 5's The Bachelor earlier this summer
– tenderly nuzzles Louise's neck as the couple giggle away happily.

And the brunette beauty can't keep the smile off her face as she gazes into the eyes of her hunky man.

Louise previously told the Mail: 'Nothing is official yet. We are still officially good friends.

'But things are definitely heating up between us. We are spending a lot of time together while filming the next series of Made in Chelsea and we are flirting a lot. The old flame is being rekindled.

'I don't know what I want. Things have been made easy for him by the fact the winner of The Bachelor cheated on him. We have had a big heart to heart which will be shown on the next series of Made in Chelsea.'

Smitten: The couple looked utterly loved-up as they rode around on carousel together

Smitten: The couple looked utterly loved-up as they rode around on carousel together

Meanwhile, the show's resident glamourpuss, Millie Mackintosh, exudes Hollywood glamour as she reclines back on a carousel horse wearing a white strapless gown.

And she admitted she is getting on much better with her fellow castmates this season after being involved in a succession of on-screen spats with the likes of Rosie Fortescue, Victoria Baker-Harber and Francesca Hull during the third series of the show.

She recently told MailOnline: 'It's really nice this series because I'm actually getting on with everyone for a change.

Leading lady: Millie Mackintosh looked the epitome of glamour as she reclined backwards wearing a white strapless dress

Leading lady: Millie Mackintosh looked the epitome of glamour as she reclined backwards wearing a white strapless dress

Innocent Rosie Fortescue looked positively angelic in a white dress, but made sure to vamp it up with a slick of red lipstick

Innocent Rosie Fortescue looked positively angelic in a white dress, but made sure to vamp it up with a slick of red lipstick

'It's already been very explosive between some of the other characters and it's nice that I'm not involved in the explosions for once.'

Elsewhere, Rosie Fortescue looks positively angelic as she sits in a waltzer in the new promo – with a slick of red lipstick accentuating her pout.

Newcomer: Sophia Sassoon looks set to mix things up for Spencer and Louise

Newcomer: Sophia Sassoon looks set to mix things up for Spencer and Louise

And a mystery brunette, who is seen riding around with a mask covering her face, is sure to stir up a spot of drama – particularly for Spencer and Louise.

Believed to be the 24-year-old broker's ex-girlfriend Sophia Sassoon, the new star has reportedly been flown in from New York in the hope of ramping up the drama once again.

The fourth series of Made In Chelsea hits E4 on October 15.