Niall, 23, said he "misses" Liam, who turned 24 on August 29, and can't wait to catch up with him.
He wrote on Twitter, "@LiamPayne happy birthday mate. Miss ya bud, see ya soon (sic)."
Liam and Cheryl are enjoying a holiday together in a mystery location.
The 34-year-old beauty has been posting photos of the couple cosying up with one another during their vacation.
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