Ariana Grande

Ariana Grande (Born on June 26, 1993) is an American singer, songwriter and actress.

13: The Musical
In a Seveteen interview video that was posted back in 2013, Ariana Grande mentions that one of her shoes came off during a Broadway show in 2008 and her shoe landed in the front row. Ariana Grande mentioned that she just continued singing and dancing with only one shoe off during the show.

#MadAboutShoe
In the second scene of Season 1, Episode 20 entitled "#MadAboutShoe", Cat Valentine (portrayed by Ariana Grande) takes off only one shoe to try on a pink abandoned shoe that she found in a bush and we only see her shoeless left foot for only a few seconds. After the pink shoe fits her perfectly, she picks up her left shoe and she loses her shoe on purpose by throwing her shoe away into a bush after saying, "It is love at first shoe, I am so over you!". In the very next scene Cat is in a dumpster looking for the matching pink shoe. When she explains to Sam Puckett (portrayed by Jennette McCurdy) about the pink shoe while in the dumpster, she is seen holding the shoe meaning that she was wearing one shoe in the dumpster, however we don’t see her shoeless foot while she is in the dumpster.

A video of the action can be seen here: https://www.youtube.com/watch?v=DgvIEVDtYNQ&t=2m30s.

Madison Square Garden
While performing at the Honeymoon Tour show at Madison Square Garden on Saturday, March 21, 2015, Ariana Grande loses her left shoe while performing the song "The Way".

A video of the action can be seen here: https://www.youtube.com/watch?v=JQExF_uBACw&t=45s.

Montreal QUE, Canada
While performing at the Honeymoon Tour show at the Bell Center in Montreal QUE, Canada on Thursday, August 6, 2015, Ariana Grande loses her right shoe while performing the song "All My Love", and her shoe slided off the stage into the audience. Then a security guard kindly returns her shoe a couple seconds later. After the song, Ariana Grande said thank you to the security guard who returned her shoe.

A video of the action can be seen here: https://www.youtube.com/watch?v=cICpIPPb_VA.

Austin, Texas
While performing at the Honeymoon Tour show at the Frank Erwin Center in Austin, Texas on Tuesday, October 13, 2015, Ariana Grande loses her right shoe while performing the song "Pink Champagne". It looks like Ariana Grande is always losing one of her shoes.

A video of the action can be seen here: https://www.youtube.com/watch?v=hRdPqdWntaw&t=2m54s.