The 25-year-old was seen hitting the town with Joan, 92, and her fiancé Peter Davidson following the award show at Radio City Music Hall in New York on Monday.
Ariana previously revealed that Nonna (the Italian word for Grandma) loved Pete and their bond was clear to see as he held her hand while crossing the road.
They weren't the only ones to party late into the night and following the ceremony the stars continued the fun– with Liam Payne, Iggy Azalea and more heading to after parties.
Liam, who has just gone public with a new girlfriend, went solo as he attended the Republic Records after part at Catch.
The One Direction singer, who was dressed all in black – was later seen cosying up to model Winnie Harlow at the bash.
Elsewhere Jennifer Lopez looked incredible wearing a catsuit she celebrated her Vanguard Award alongside boyfriend Alex Rodriguez.
Rita Ora made sure all eyes were on her as she wore a wild feathered dress to an afterparty.
Earlier in the evening Ariana had appeared emotional as she won the Best Pop prize at the MTV Video Music Awards.
No Tears Left To Cry was the American singer's first single after a suicide bomber killed 22 people at her concert in Manchester in May last year.
Accepting the award for the song Ariana ,25, thanked her family, fans and fiance Pete Davidson, who was seated in the audience.
She won the award over Camila Cabello, Demi Lovato, Ed Sheeran, Pink and Shawn Mendes.
The VMAs, which has gender neutral categories, was opened by rapper Cardi B who appeared on stage cradling an object wrapped in a towel.
The new mother, who led the way in nominations with 10, welcomed daughter Kulture in July, her first child with Migos rapper boyfriend Offset.
But fans anxious to get a first glimpse of the little girl were disappointed when she revealed she was carrying a Moonman, the statue awarded to VMA winners.
Cardi B, who debuted a new shorter hairstyle, then introduced Canadian singer Shawn Mendes on to the stage, who performed his hit single In My Blood.
The first prize of the night was Best Hip-Hop. It was won by Nicki Minaj for her song Chun-Li.
She beat out competition from Cardi B, the Carters, Drake, J Cole and Migos.
An emotional Nicki thanked Grande during her acceptance speech. The award for Song Of The Year went to Post Malone.
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