"For the best ... Singing together has changed my life," Gaga tweeted yesterday, along with a photo of the banner. "Let's trend it worldwide so I can tell him! #HappyBirthdayTonyBennett I love you baby you're the best!," she said as well, sharing a photo of her kitted out like Jo Calderone posing with the legendary singer.
Bennett also shared a snap of the plane, writing, "Dear Lady, you said there will always be flowers but this is ridiculous! Best birthday ever."
Gaga recently announced that she and Bennett are teaming up for a jazz album titled Cheek to Cheek, due out September 23.
Judging by Gaga's Twitter account -- which is plastered with snaps of her and Bennett together -- and yesterday's birthday wishes, it's safe to say that Mother Monster is more than a little excited about her pair-up with silvered-haired crooner.