The France international celebrated the milestone on Tuesday and his partner was quick to dedicate an Instagram post to the Red Devils forward.
The couple have been dating for some time now and Melanie posted the picture above of the couple on a recent holiday on the social network.
She shared the snap and wrote the caption: “HAPPY BIRTHDAY MY EVERYTHING ❣️
“No speech you already know everything ❣️.”
Martial has been in good form for Manchester United when called upon this season, with the striker having scored six goals and made three assists in the Premier League so far.
That’s despite Martial having been limited to just seven starts on Manchester United’s 15 Premier League games so far this term.
It was Martial’s neat turn and lay-off which set up Jesse Lingard for Manchester United’s second goal in their 3-1 victory over Arsenal at The Emirates in the Premier League last weekend.
The forward will be hoping to feature when Jose Mourinho’s men return to Premier League action on Sunday with a crunch derby clash against Manchester City at Old Trafford.
Manchester United head into that game in second place in the table and eight points behind the leaders.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news