Verified answer

do you know if it was a girl or guy group singing ><

sounds like girls generation- paparazzi

"ooh la la la~ la la la la"

SNSD - Paparazzi

KARA - Step

KARA - Mister

Big Bang - Lalala

Mighty Mouth - Lalala

Maybe google something along the lines of 'kpop lyrics la la la'.

Surely, things will come up. ^-^

Bigbang Lalala Lyrics

SNSD - Paparazzi

Kara - Mister

Big Bang - Lalala

Super Junior - Be my Girl

Maybe its the song by SHINee called Stranger on their CD called Sherlock (the singer says oh la la la.....). :)

http://m.youtube.com/watch?v=2um20eDzg1Y

Crayon Pop (크레용팝) - Lonely Christmas

KARA - Mr. ? maybe?

http://www.youtube.com/watch?v=s2EQm6WPMHs

Also SNSD Paparazzi has the oh la la la thing going on also lol

http://www.youtube.com/watch?v=IUqP1xzRZkw

There is also Lalala by Se7en.

Even if that's not the song, go give it a try.

1 . kara - mister

2. snsd oh lala

3. bigbang lalala

BIGBANG - La La La