Lucy Mecklenburgh posts PDA picture with rumoured husband-to-be Mario on Twitter

Goodnight… fianc Lucy Mecklenburgh posts PDA picture with rumoured husband-to-be Mario on Twitter

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UPDATED:

15:33 GMT, 5 June 2012

They may be keeping mum on those engagement rumours, but Lucy Mecklenbugh and Mario Falcone have no problem showing off how in love they are.

The TOWIE couple posted a PDA picture on Twitter yesterday evening, wishing their fans good night.

The self-portrait shows them sharing a kiss in bed as they prepared to go to sleep.

'Sleep tight... fianc' Lucy Mecklenburgh tweeted a PDA picture of herself and boyfriend Mario Falcone kissing goodnight

'Sleep tight… fianc' Lucy Mecklenburgh tweeted a PDA picture of herself and boyfriend Mario Falcone kissing goodnight in Marbella

Lucy declined to respond to a number of her fans who replied to the picture on the social networking site, requesting that she clear up rumours that she has accepted Mario's proposal.

According to onlookers in Marbella over the weekend, Falcone, popped the question to his girlfriend during a moonlit boat ride.

But when they returned to shore, the reality stars ensured they kept their poker faces in place and have since refused to acknowledge the rumours.

Are they or aren't they Lucy and Mario are rumoured to have become engaged this week during filming of The Only Way Is Marbs in Marbella

Are they or aren't they Lucy and Mario are rumoured to have become engaged this week during filming of The Only Way Is Marbs

It is believed that their engagement will be the big finale for TOWIE's summer special The Only Way Is Marbs, which is set to air on June 13, and that producers are keen to keep the dramatic storyline under wraps.

The cast have been filming scenes in the holiday spot for the past week but are returning to their usual Essex stomping ground today.

Mario and Lucy began dating last summer and he was quickly introduced to TOWIE viewers in the first episode of season three.

'Don't look happy': The couple are believed to be trying to keep the news under wraps to get high ratings for the TOWIE special, which airs next week

'Don't look happy': The couple are believed to be trying to keep the news under wraps to get high ratings for the TOWIE special, which airs next week

Their relationship hasn't been all smooth-sailing though, with the couple briefly splitting after it was revealed that Lucy had lied about waking up in bed with ex-boyfriend Mark Wright during a holiday last September.

The couple had only just reconciled when Lucy found a string of racy emails between Mario and other women.

But the duo have been getting along far better this year, with Mario asking fashion boutique owner Lucy to move in with him in a recent episode.

The Only Way Is Marbs airs on June 13 on ITV2.

TOWIE takes over town: Lucy has been partying with her co-stars including Lydia and Cara in Marbella

TOWIE takes over town: Lucy has been partying with her co-stars including Lydia and Cara in Marbella