The One Direction star certainly appeared to put an end to the whole 'are they, aren't they dating' speculation by uploading an old photo of Cheryl to his Instagram account in honour of International Women's Day on Tuesday, 8 March.
His smitten caption read: "Happy #internationalwomensday to my favourite woman in the world. Hope I make you as happy as u make me X."
More than 500,000 people have favourited the post so far.
Liam and Cheryl are thought to have begun dating at the end of December, after meeting up again on the X Factor finale after Cheryl's split from husband Jean-Bernard Fernandez-Versini.
After rumours of a romance surfaced in February, they appeared to confirm them by sharing a black and white photo to Instagram showing Cheryl, 32, cuddling up to a shirtless Liam, 22.
More photos of them together followed.
X Factor favourite Sinitta recently told Reveal about what happened when Liam bumped into Cheryl in December at the finale: "He definitely kind of swooned like, 'Wow, Cheryl, she's hot' kind of thing.
"I remember thinking it was so sweet because these guys have everyone in their faces - US stars, supermodels and all the big American pop stars - they've basically had every pop star and supermodel around the world in their faces for the last five years and he comes back and it's our Cheryl that makes his heart go... I thought it was sweet."