The pop superstar, who turned 28 on Friday and is produced at the famous Roseland Ballroom in New York, celebrated the end of this very special day with her baby and she suggested that his presence was unexpected.
"Another incredible moment. I love surprises!" wrote the interpreter of "GUY" in an adorable black and white lovers.
It reveals the actor Chicago Fire leaning in to kiss his girlfriend, while singer smiled, looking straight into the lens.
Musical sensation showed no gifts offered by Kinney, but Gaga has unveiled a glimpse of the very special gift of Donatella Versace .
After several outfit changes during the day, "Mother Monster" donned a leotard rhinestone long sleeve Martian style, long platinum blond wig and heels 30 cm roses shaped tentacles for the festivities after his concert .
In the early evening, Gaga launched its series of seven concerts in the famous New York room, concert which his friend James Franco attended.
"HAPPY BIRTHDAY, Gaga!" wrote the actor enthusiastically under a photo of the duo behind the scenes of the concert and posted on his Instagram.
Entertainment weekend continued for couple of stars, who went back to Franco's Broadway show, an adaptation of the famous The Mice and Men on Saturday night.
"I love my puppy bag, I exploded tonight in Of Mice and Men", has tweeted Gaga, with a photo where she is wearing a dress and a hat covered with pink flowers with an adorable doggie bag. "I love going to the theater."