The former glamour girl looked happy and relaxed as she headed into Annabel's Private Member's Club in Mayfair with her new man.
She was dressed in a purple satin mini-dress and wore thigh high boots.
Alex meanwhile looked dapper in a fitted blue suit and white shirt.
Her outing comes as she continues treatment at The Priory after being diagnosed with post-traumatic stress disorder,
Her rep confirmed to The Sun Online today that she would be heading back to rehab after the weekend telling us, "“She is still undergoing treatment and making progress daily. Her treatment resumes as normal on Monday.”
She also took a break from rehab last weekend to enjoy a romantic meal with Alex.
The former Loose Women star, 40, was pictured on a date at Hove's La Piazza restaurant but onlookers exclusively told The Sun their evening was short-lived as the pair left after just 20 minutes.
A source at the time told us: "Katie was behaving like she was quite agitated. She kept fidgeting and looking around.
"They didn't look like a happy couple – they didn't look loved-up at all. They only stayed for around 20 minutes before they got up and left."
The Sun also exclusively revealed yesterday how Katie has taken Alex to meet the children she shares with estranged husband Kieran Hayler.
A source told The Sun Online: "Alex is very much a part of Katie’s life and has stayed over at the house when Bunny and Jett have been there, so he’s met them.
"She’s only introduced him as a friend but they’ve met him. It might seem quick to most people but she’s really loved up with him.”
The mum-of-five is being treated as a day patient at The Priory with sources telling The Sun Online that she's already feeling much better.
One told us: "Rehab has been really good for Katie, she said she wishes she’d done it years ago.
"She reckons it would have saved herself a few years of 'crap men’, as she calls it.
"Psychologists have told Katie that she attracts sociopaths, not necessarily bad ones, just men who are very friendly on the surface, but, ultimately, are fake and emotionless on the inside."
Katie has had a rollercoaster love life, which includes three marriages and several doomed romances with sports stars.
Her last husband Kieran, 31, was caught cheating with her best friend Jane Pountney and a teenage shop assistant.
The TV personality began her romance with wealthy Essex native Alex last month after she ended her relationship with personal trainer Kris Boyson.
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