Reynolds uploaded the video to his Instagram account on Friday, showing both himself and Bullock singing “happy birthday” to White in different clips.
The video cuts between both Hollywood stars, with Bullock teasing: “Happy birthday from Sandy, who loves you more than Ryan”.
Reynolds mimics Bullock by replying: “From Ryan, who loves you so much more than Sandy.”
As Bullock continues to sing the lyrics of “Happy Birthday”, the video frequently cuts back to Reynolds and his playful interjections.
“What does Sandy do you for you every year?” Reynolds teased.
“Does she, like, show up and hand-deliver flowers for you, wearing nothing but black socks and a dozen gold bracelets just like you requested? ‘Doubt it.”
Bullock concludes the video by telling White, “I love you” before giving the camera a kiss.
The video finally changes back to Reynolds, who pretends to sob.
Finally, the video closes with a birthday banner for the Golden Girls actor while the show’s theme song plays in the background.
The video has already garnered more than 6.4 million views and thousands of comments from fans, including celebrities.
Mariah Carey wrote: “Awww happy birthday Betty!! (Sidebar-you know I love that movie right??)”.
Meanwhile, David Beckham commented with a series of heart emojis.