Addison Rae is showing lots of skin on tour ... and she's giving folks a clear view of her buns.

Check out these photos Addison just posted on social media ... the singer is showing off her cheeks in a revealing leather bikini bottom.

Seems like Addison was feeling how she looked from the back ... because she whipped out her phone to snap a mirror selfie and then blasted the image out on the internet.

Addison also shared a photo from the crowd from a recent show ... and as you can see, she's dancing seductively and wearing nothing but some lingerie. Gallery Launch Gallery

Her shows are a hot ticket ... literally.

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