The pair have split after calling time on their 14-month relationship.
A spokesperson for Olympian Louis confirmed the news to The Mirror, but declined to comment further.
Louis Smith and Lucy Mecklenburgh
However, a source told The Sun that they hit the rocks after discovering that “they wanted different things”, as Lucy wanted to settle down and start a family, while Louis is concentrating on his career as a gymnast.
They reportedly had a make-or-break holiday to Thailand over the Christmas period, but it failed to save their romance.
“Louis really had led Lucy on in that they’d discussed marriage and kids at length – it came like a bolt out of the blue and doesn’t really make any sense to her.”
The pair started dating in 2014, after meeting on BBC One gymnastics show ‘Tumble’, where Louis was a judge and Lucy was a contestant.
Louis is currently in training for the Brazil Olympics later this year, while Lucy has also built a successful fitness empire since leaving ‘TOWIE’ in 2014.