Janet Jackson's Badonkadonk -- Is that FOR REAL?

No, seriously. Is it for real? Like, really really? Like, REALLY REALLY???? It sure has lotsa… lift!

You go, Janet!!!! *snap*snap*

Janet, 41, celebrated the Fourth of July with her boo Jermaine Dupri at a rented house in Miami. The couple videotaped each other and took the jetski out for a ride. The singer is also in town recording her new album with record exec LA Reid.