Tish & Noah Cyrus Sued -- Thanks for the Rear-End ... Now I Can't Get It On!

Miley Cyrus' little sis Noah was texting behind the wheel and rear-ended a guy who now can't keep the missus happy ... according to a lawsuit obtained by TMZ.

EJ Hawkins is suing the 16-year-old, claiming he was cruising on the 101 in L.A. when she slammed into his car, sending him to the hospital.

EJ claims in addition to the physical pain, he's suffered "loss of love, affection, companionship, comfort, society and sexual relations."