The 'What Makes You Beautiful' singer is currently in Manila, Phillipines with the band on tour, which means he's been parted from his sweetheart.
Yesterday, the star uploaded a rather gorgeous shot of Sophia gazing out at a beautiful landscape alongside the simple caption: "I really miss you."
Liam and Sophia were childhood friends before they began dating.
The singer's tweet came after it was confirmed bandmate Louis Tomlinson had split from his long-time girlfriend Eleanor Calder.
Over the weekend, a rep for Louis said: "Louis and Eleanor split up two weeks ago. They have not announced this as they wanted some privacy during this time."
Meanwhile, another 1D star has been facing relationship rumours as well…
Zayn Malik was forced to publicly declare his love for Little Mix fiancée Perrie Edwards after photographs emerged of him holding hands with another woman. He tweeted: "I'm 22 years old... I love a girl named Perrie Edwards. And there's a lot of jealous f**ks in this world I'm sorry for what it looks like."
He was later signed off the One Direction world tour with stress. He flew back to the UK last week but is expected to rejoin the band for their Cape Town concert later this month.
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!