on cloud nine

on cloud nine  {adj. phr.},  {slang}

~На седьмом небе от счастья.

О большем и не мечтающий; очень счастливый.

Ada has been on cloud nine since the magazine printed the story she wrote.

We were on cloud nine when our team won the state championship.

Ср.: ON TOP OF THE WORLD, WALK ON AIR.