Mariah Carey flashes her bum hours after sister is arrested for prostitution (Photos)

The bootylicious 46-year-old singer gave fans a glimpse of her bum on Instagram ahead of her latest show in Vegas last night.

Wearing a glittery leotard and fishnet tights, Mariah flashed her sizeable behind in the cheeky snapshot.

She captioned the racy picture: “Last looks before showtime.”

The diva’s raunchy pictures come just a day after Mariah’s estranged sister Allison was arrested in New York by undercover police officers.

It is alleged Alison was working out of an unnamed local hotel and “soliciting money in exchange for sexual favours”, reported the Daily Freeman.

Police were allegedly alerted after being tipped off about ads which contained lines similar to Mariah’s 1995 song Fantasy .