True to form the glamour model and her man joined the audience of the biggest show in Britain - the X Factor.
And just in case anyone missed them they went backstage to mingle with the crowd of journalists and celebrities at the bar.
Katie had earlier made a point of stressing that she and Alex were just friends.
She wrote on her Twitter page: 'On way to ex factor with my FRIENDS melodie alex an max can't wait ...wonder who will win excited xx'
As they arrived for their date at Fountain Studios in London the pair made a show of being alone, despite sharing a car.
Reid climbed out first and hid in McDonalds, while Katie made her red carpet entrance. Once inside they visited Simon Cowell in his dressing room.
The X Factor boss is an old friend of Katie's, and she was one of the guests at his all-star 50th birthday party earlier this year.
At a backstage bar, Katie told the Daily Mirror: 'We’re just seeing how it goes. I don’t care what anyone else thinks – it’s up to me who I go out with.'The pair were seen dancing to JLS and Alexandra Burke, and kissing and holding hands.
They shared a bottle of champagne, with Alex resting his hands on Katie's shoulders and keeping her by his side.
It was a different story when they split, with Katie accusing Reid of selling stories about their relationship.
The 31-year-old, who has made a career out of publicising her private life, said she had told Reid not to talk to the press.
He had flown out to Australia to propose to the mother-of-three, and was said to be devastated when she refused to even acknowledge him.
But it seems he has been forgiven - at least for now.