Keira Knightley's former beau has been dating his wife-to-be for a year and let slip their happy news on Tuesday night...

Homeland star and Keira Knightley‘s ex, Rupert Friend, 33, is engaged to his girlfriend, Paralympic athlete Aimee Mullins, 38.

The model and sportswoman let her good news slip on the red carpet at the L’Oreal event, Paris Women of Worth Awards, when she called Rupert her ‘fianc√©’.

The couple have been dating since 2013 and although Aimee is not wearing an engagement ring yet, party-goers at the event said they looked very loved-up.

‘He was very doting the whole night, pulling out her chair, opening the car door,’ a source said. ‘They were really adorable, just enjoying the night and each other’s company.’

Another source on the set of TV show Homeland has said: ‘They come on set together holding hands and are obviously very much in love.’

Rupert, who dated fellow actress Keira, 29, for five years, is so private that he refused to speak about the romance at all during their time together but it’s thought they split due to work commitments and the pressure of dating a superstar. Meanwhile, Keira married Klaxons star James Righton in France last year and is now rumoured to be pregnant.

But now Rupert‘s found love again too and it seems his relationship with inspirational Aimee couldn’t be anymore different from his past high-profile romance. Since she had her legs amputated when she was just one year old, Aimee loathes being described as ‘disabled’ and has gone on to become a famed public speaker, top athlete and successful model, even becoming a muse for the late Alexander McQueen.

She has competed in the Paralympic Games and set three world records in the 100 and 200 metre sprints and long jump. She was also named one of the 50 Most Beautiful People In The World by US magazine, People.

Aimee, who was born without fibula bones, has said: ‘It takes some women till their 30s or even 40s to realise that what makes them beautiful is not what makes them the same as everyone else, but what sets them apart. I got there earlier.

‘First I had to accept that I wasn’t normal, and then I learned that what I had been told would be a weakness wasn’t. So by my 20s I was able to think, “Thank God I am not normal, because I get to be extraordinary instead.”‘

SEE PICTURES Keira Knightley at the Anna Karenina London premiere

SEE PICTURES Keira Knightley and James Righton in Engaged Celebrities

SEE PICTURES Keira Knightley – wedding belle

Amy Brookbanks