Lewis and Nicole were in an on-off relationship for seven years, but it was reported last month that they had finally called it a day once and for all.
It has now been claimed that Nicole has severed all ties with the Formula 1 racing driver, and the pair have now even unfollowed each other on Twitter.
Pretty brutal, you two. You know there's a 'hide' option, right?
A source tells The Sun on Sunday: "The split has been devastating for Nicole. She feels the only way she can move on is by putting distance between her and Lewis.
"While their split was amicable, she and those around her feel it’s not healthy for them to remain friends."
After completing her recent stint as Grizabella in 'Cats', Nicole has taken some time out, and was recently seen soaking up the sights in Venice.
The former Pussycat Dolls singer admitted in an interview last month that she "still loves" Lewis, adding: "[Our split] was the hardest decision we had to make, but we made it together.
“We wish nothing but happiness and the very best for one another. I’m trying to stay strong in my faith right now.”