The Sun Online can exclusively reveal the ex-glamour model reached out after hearing he had split with his long-term girlfriend Faye Brooks.
She sent flirty messages to the Pop Idol star just before she checked into The Priory following drink and drug binges.
An insider told us: "Katie's back in contact with Gareth. She read that he's single again and wanted to say hi and see how he was after the split.
"She loves to message exes after a few drinks, so just before she went back into rehab she sent him a few late night messages after getting his number from a mutual friend.
"She just wants to catch up with him but she was also being a bit cheeky and flirty too."
Gareth's publicist had no comment. Katie's publicist has been contacted for comment.
Katie was pregnant with her son Harvey when she had sex with 17-year-old Gareth who strongly denied the fling when it was made public.
The one-night stand led Gareth to quit showbiz for while after his lies were exposed.
Speaking in 2016, Gareth explained: "“I denied the whole Jordan thing because I was 17, I didn't want my family to find out about my sex life. If I hadn't lied it wouldn't have been a big deal, my family, friends and fans wouldn't have felt as let down I guess.”
Katie admitted their affair was a mistake, adding that "it was over in seconds".
Now it appears Katie hopes to put the past behind them after a rocky year.
It's not known whether Gareth has chosen to let Katie back into his life.
The singer called it quits on his six-year romance with Faye last month after rows over her nights out with Corrie co-stars.
A source told The Sun Gareth was "very controlling" towards the actress.
But the pair insist they're still "the best of friends", despite keeping quiet about the relationship breakdown.
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