27.07.2010 Backstreet Boys On Lopez Tonight - If I knew Then 

This song has been my ringtone for close to a decade now.

I loves Nick's voice! He makes me cry

freakin' love this song

Lovi it when howie takes high notes as centered

they are so damn great!!!!!!!!!!!!!!!!!!! I LOVE THEM, NO MATTER HOW MANY YEARS GO BY I WILL FOREVER BE A BSB GIRL! lol

che dire canzone fortissima tutta da ballare ❤❤❤❤❤❤

Rewinding this several times

The BEST part is to see/hear how much FUN our fellas are having! Terrific performance & thanks so much for saving it here, for all to see, despite the recent passing of Lopez Tonight.

I absolutely love this song

Awesome choice for ringtone.

"If I Knew Then" track 5 and the 3rd single from The Backstreet Boys' 6th album "This Is Us"

Ths song deserved on te top bilboard!!

eu nunca vou deixar de amar esses homens e essa carreira de ouro

i love them i here them i am only 11 i wish i could meet them i used to here them when i was 2 my dad them my dad will put it and my dad look like him!!!!!!!! i wish i could see them

luv my boyband.

my favorite song rn

i love this song

Looove them forever

2021 activo

1 of the best songs on the 'This is us 'album!

brian is my comfort person🥺💙

love this band

Great performance!👍👍👍👏👏💋💋

I was there for this performance. It was so good!!

Amazing live version!!!

i like the way there danceing

best song ever !!!!

ONE OF THE BEST SONGS OF THIS IS US ALBUM

NICK :(( :(( so damn cute :(( :((

I just love AJ's voice :)

See performance de leave me with goosebumps

Os melhores crushs da vida

this is awsome

AJ👏

Oh dear. Im still in love. :)

2018 anyone?

AJの声好きだわ〜

2022

Sorry but the song title is ''If I Knew Then'' :)

My mom has this cd i think it's really good, but where is their 5th member?

Such a big song and not relaesed 😔

THEY ARE SO HAWWWT, I'M DONE.

Where’s Kevin