Tom Holland Calls Zendaya 'My MJ' in Sweet Spider-Man -Themed Birthday Tribute — See the Photo

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Tom Holland made his relationship with Zendaya Instagram official in the sweetest of ways.

The Spider-Man actor, 25, wished his costar and girlfriend a happy 25th birthday on Wednesday with a cozy mirror selfie of the two in costume for their Marvel roles.

"My MJ, have the happiest of birthdays. Gimme a call when you're [sp] up xxx," Holland captioned the shot, which shows him in his Spider-Man suit with Zendaya close behind him as she takes the picture with a camera.

The post comes weeks after the two have started showing off their real-life love in public.

They were first linked again in early July when they were seen sharing a steamy smooch inside a car.

Tom Holland/Instagram
Tom Holland/Instagram

Since being spotted earlier this summer, Holland and Zendaya have been seen attending a friend's wedding together and grabbing dinner out.

RELATED: Zendaya and Tom Holland's Complete Relationship Timeline: From Making Spider-Man to Steamy Kiss

zendaya, tom holland
zendaya, tom holland

Kevin Winter/Getty Images Tom Holland and Zendaya

A source previously told PEOPLE back in July 2017 that Zendaya and Holland were romantically involved, though they were linked to other people in the years between the latest sightings.

This is not the first (or even second!) time a Spider-Man franchise has yielded real-life romance. Kirsten Dunst and Tobey Maguire began dating while shooting 2002's Spider-Man, but ended their relationship before shooting 2007's Spider-Man 3.

For more on Tom Holland's birthday post to Zendaya and other top stories, listen below to our daily podcast PEOPLE Every Day.

Emma Stone and Andrew Garfield began dating after filming 2012's The Amazing Spider-Man. The two confirmed they'd split in 2015 but remained supportive of each other's career successes.

Zendaya and Holland's third Spider-Man movie together, No Way Home, opens Dec. 17.