Rumours of the former flames getting back together have been doing the rounds for a while now, with many speculating the 26-year-old had joined Hugo in Monaco this weekend for his birthday.
And now we can reveal that definitely was the case. Last night (30 May), the former Made In Chelsea star took to Instagram to share a snap of the pair kissing! Eek.
In the photo, Millie has her arms wrapped around Hugo as he leans in to kiss her. And with a picturesque sea view background, the romantic photo proved what we'd all been thinking - these two are most definitely back on.
Millie, who officially divorced from Professor Green last week, captioned the post with: "What a perfect end to an amazing weekend #hugodirtythirty".
Hugo also shared a black and white photo of the pair posing with Game Of Thrones actor, Liam Cunningham, as they partied at the fancy Cipriani in the glitzy French location.
It seems like Professor Green may have also reacted to the news. Yesterday evening, the rapper took to Twitter to write: "Money really can't buy you class can it" and many fans have speculated it was a dig towards his ex-wife. One user wrote, "Better off without her #GirlBye".
Millie and Hugo were first together on our screens during Made In Chelsea, but it came to an abrupt end when it emerged Hugo had cheated on her with fellow co-star, Rosie Fortescue.
Since then, Millie went on to date and marry rapper Professor Green, but the pair sadly announced their split at the beginning of this year. Meanwhile, Hugo got together with Natalie Joel, who also appeared on Made In Chelsea. However, the couple also ended up going their separate ways