The couple treated their little girl to a celebration at Nickelodeon Universe in New Jersey.
"Because im obsessed w me fiancé and WE’RE REAL," the star wrote on Instagram.
The two have been fueling romance rumors since February.
"I can’t breathe," one fan tweeted after the pop star was filmed smooching the model.
"IM HERE FOR THIS," tweeted one fan after the two singers were reportedly spotted on a steamy date in New York City.
The pop star previously released her smash hit "Flowers" on her ex-husband's birthday this year.
"I’m so glad you were born, my love," the singer wrote on Instagram, sharing a handful of photos of the actress.
"Your first unwarranted PR disaster," the actress wrote on the guitarist's Instagram post.
"There has been no third party interference in this relationship of any kind," the actress wrote.
"I had the best Valentine’s dates last night," Legend captioned a new snap, adding a heart emoji for each person.
