Ariana has gushed about her love of all things Harry Potter before, so you can imagine her excitement over getting to hang out with them. Ari posed for pics with the actors, her dog Sirius (named after Potter character Sirius Black) and her brother, Frankie.
Ariana captioned a pic: ''Neville, luna and sirius all in one photo. @msevylynch told me i'm the sweetest Slytherin she's ever met. thank you @msevylynch @realmattdavelewis for coming to my show and making my night!!! i adore y'all. #TheyWalkedInAndDeathlyHallowsWasPlayingOnMyTv #MyWifiPasswordInMyDressingRoomIsHarryPotter #iwasembarrassed #ohwell (sic)''
The feeling was mutual, it seems, as Evanna posted pics from the concert, captioning one pic of them: "I made a new vegan friend who also happens to be a Potter geek and the most glorious sassy shining star @arianagrande you were utterly amazing thank you for having us #O2London #honeymoontour"
Frankie posted a pic of him and Matthew, writing: "that time @realmattdavelewis came to Ari's concert and had NO IDEA what CRAZY POTTERHEADS we are! (btw, just the nicest kindest person.)"
Matt wrote: "Chilling backstage at the O2 and look who rocked up... @arianagrande totally killed it last night!
Mi corazón 💜 😍 Neville y Luna con Ariana. ¡Y Sirius! pic.twitter.com/q5nvG8M8V0— Gara. (@GaraBibble) June 2, 2015
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Gallery | Best of Ariana Grande Memes