Last night (20 August), Liam held Sophia's hand as they made their first red carpet appearance together at the premiere of One Direction's new film This Is Us.
But today, however, it appears Sophia - who describes herself as a 'glamour model' - has found herself on the receiving end of some rather nasty tweets.
The brunette's Twitter account is full of provocative pictures of herself posing in revealing underwear and it seems this has riled some 1D fans.
Sophia has been responding to some Twitter users, including to one who had attempted to set up a fake account in her name.
She said: "LOL. You sly little tw*t. Nice fake account to copy my name. Shut it down before the police do."
Liam has now taken to Twitter and ranted at fans, apparently defending Sophia from vile comments.
always sad to get on here to read horrible stuff about someone you care about...— Liam Payne (@Real_Liam_Payne) August 21, 2013
He said: "Always sad to get on here to read horrible stuff about someone you care about.
"There is that old saying tho, if you ain't got sh*t nice to say then f*** you."