The surprising news comes only three weeks after their loved-up couple's photo shoot, shot in Dubai for Hello! magazine, hit the newsstands.
Reports indicate that the pair, who have been dating for 14 months, had grown apart because they wanted different things for their futures.
Whilst the former TOWIE star, 24, wanted to settle down and get serious, sources reveal that Louis, 26, didn’t, want to commit.
A source told The Sun newspaper; ‘Lucy and Louis wanted different things.’
The Essex girl and the 26-year-old sports star beau were not shy about declaring their love for each other on their social media platforms.
And it seems Louis had seemed extremely committed in private too; ‘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 source added.
The pair were seen jetting off on several luxurious holidays already in 2016, recently heading to New York, and to Thailand to celebrate their one-year anniversary.
Many fans had even speculated that a proposal was on the cards.
The source added; 'They really hoped their holiday [to Thailand] would bring them back together but if anything it just made things worse."
The split comes only weeks after Louis publically said Lucy was a 'keeper' and posted a picture of his beau with the caption; 'You know she's a keeper when you ask her to tie your shoe laces and she agrees ha true love.'
Lucy's turbulent love-life has also been well documented on her stint on the ITV2 reality show.
Louis Smith previously appeared in the 2012 series of BBC One's Strictly Come Dancing.