Lily Allen is plugging her new album in an unusual way ... she's selling butt plugs that double as a USB drive containing her new tunes.

The singer is hawking the sex toy-shaped electronics on her website for $34 a pop ... and while it looks like a blue-and-white polka-dot butt plug, Lily says it's really "a novelty USB device intended for data storage only." Sure, Jan.

Lily sings about finding butt plugs and other pleasure toys in her song "P***y Palace," which is on the new album, and accuses her partner of using them -- plus a treasure trove of other kinky items -- to cheat on her.

The lyrics go ... "Sex toys, butt plugs, lube inside / Hundreds of Trojans, you're so f***ing broken / How'd I get caught up in your double life?" Gallery Launch Gallery Getty

Lily's album is c

See Full Page