Paris Hilton and River Viiperi celebrate anniversary by partying in Cannes again... as he tweets she is his 'future wife'

She might not have any films to promote - if you disclude her cameo in Sofia Coppola's The Bling Ring - but Paris Hilton is certainly making the most of the party circuit in this years' Cannes festival. The 31-year-old Simple Life star was out again on Saturday night with her hunky 21-year-old boyfriend River Viiperi keeping close by. And the Spanish model took a moment to celebrate his one-year anniversary to the hotel heiress - and sparked engagement rumours as he referenced her as his 'future wife'.

Wedding bells? Paris Hilton and River Viiperi continue to party in Cannes as they celebrate their one-year anniversary together and River hints at marriage

The very happy couple have been inseparable during their tour of the French film festival with a number of stop offs at various high-profile events. The drinks have been flowing as the pair have partied late into the night since they arrived at the annual event. They were in the company of legendary film director and Monty Python Terry Gilliam who was hosting the Zero Theorem party at Torch nightclub at Vegaluna Beach.

Blonde ambition: The Hilton hotel heiress looked well groomed for her latest night out in Cannes

The director's latest film stars Tilda Swinton and Matt Damon in a typically wacky adventure. For the night's celebrations Paris wore an off-the-shoulder black sparkling catsuit, high heels, a classic white watch, and Avakian jewellery. Meanwhile dapper River looked sharp in a finely tailored suit for their new night of partying.

Midnight style: Paris stepped out in a stunning off-the-shoulder black catsuit for her latest night out

Relaxing on a staircase together the couple looked blissfully happy.

And it was on social network site Instagram that the model made reference to making the blonde bombshell his permanent squeeze.

'Happy 1 year anniversary to the gorgeous, beautiful, perfect, most amazing & most caring girl in this Planet,' he said, lavishing praise on the Californian beauty.

Telling tweets? River tweeted an Instagram link to a picture of himself with Paris where he called her his 'future wife'

Then he added: 'My girlfriend, my future wife, my LIFE yes! My amazing blondie @ParisHilton #1Year #4Life'

The couple were originally thought to have got together last September during New York Fashion week, however it would seem their couple status had been running since the time of Cannes last year as they now celebrate one year together.

And River's statement that Paris is his 'future wife' has already sparked rumours that they may one day tie-the-knot.

Triple trouble: Paris was joined by her fellow blonde friends - Playboy bunny Kristin Nicole and TV presenter Hofit Golan

Leader of the blonde pack: Paris stood out from her fellow blonde friends in her latest statement outfit

The pair were joined on their night out by fellow blondes, TV presenter Hofit Golan and Playboy bunny Kristen Nicole - who appropriately appears to be Miss May.

The three babes could have passed for sisters as they all wore black for their night out and matched with their blonde locks.

Beautiful couple: There is no disputing Paris and River make a 'hot' couple

Locking lips: The couple couldn't resist each other as they stepped onto a boat together in the French town

Floating on love... and water: The couple looked blissfully happy together as they joined friends for their latest evening of merriment

Continental fun: The pair have been partying hard during the French film festival, making the most of premieres and after parties

As well as partying at Tourch, the coupe were seen getting close on a boat earlier in the evening.

In what is fast becoming tradition, they made a public display of affection while on board, making sure that everyone could see just how happy they are to be together.

They locked lips while on the water and laughed and smiled in each others company.