Celebrity Celebrity Relationships Celebrity Dating See Zendaya's Flirty Response to Tom Holland's Cute Birthday Tribute: 'Calling Now' Tom Holland called Zendaya 'My MJ' in a sweet post on her 25th birthday By Ale Russian Ale Russian Ale Russian is a contributing writer at PEOPLE. She has been working at PEOPLE since 2023. Her work has appeared in Women's World, First For Women, Biography.com and the Chicago Sun-Times. People Editorial Guidelines Published on September 1, 2021 02:12PM EDT Zendaya isn't keeping Tom Holland waiting on her birthday. After the British actor, 25, posted a birthday tribute to his Spider-Man costar and rumored love, Zendaya made sure to respond on his Instagram post. "My MJ, have the happiest of birthdays. Gimme a call when your up xxx," Holland wrote alongside a cozy mirror selfie of the two still in their Marvel costumes. "Calling now♥️," Zendaya replied just a few hours later, as seen by Comments by Celebs. Holland's tribute to Zendaya on her 25th birthday also served as their official Instagram debut. The post comes weeks after the two have started showing off their love in public. Tom Holland Calls Zendaya 'My MJ' in Sweet Spider-Man-Themed Birthday Tribute — See the Photo They were first linked again in early July when they were seen sharing a steamy smooch inside a car. For more on Tom Holland's birthday post to Zendaya and other top stories, listen below to our daily podcast PEOPLE Every Day. Since being spotted earlier this summer, Holland and Zendaya have been seen attending a friend's wedding together and grabbing dinner out. Tom Holland and Zendaya. Kevin Winter/Getty Images Zendaya and Tom Holland's Complete Relationship Timeline: From Making Spider-Man to Steamy Kiss 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. Zendaya and Holland's third Spider-Man movie together, No Way Home, opens on Dec. 17.