T&S "I know, I know, I know" adoreable little girl in audience sings along 

Tegan would be a lovely lovely mother :3

I love it. So many performers you see FLIP SHIT when someone tampers with any aspect. Tegan and Sara went along for the ride and enjoyed their young fan. It only makes me love this band more. Very impressive!

hahaha at the very first when Sara was singing the backing vocals I thought it was actually the little girl and almost fell off my seat. I was like "HOLY CRAP SHE'S GOOD! SHE SOUNDS LIKE SARA!!" then I realized she actually starts singing at around 0:15 LOL

The way I want Lena to show up on the next tour cycle to sing this with them all grown up.

I love their laughs, so cute and the little girl voice, cutest thing ever!

I love Tegan's look of "yes, nailed it!" at 2:12 :)

naww tegan

this made me smile.

I don't think its possible for them to be anymore adorable.

This is the cutest thing in the whole world!!!! I LOVE TEGAN!!

my heart just exploded :D

Sara is "So Jealous" of Lena!

haha aww i love the way tq sings 'stressing.' this video was just overall filled with adorable

SO-KIUUUUUUTE! ^_^ and she did not bad at all -better than I could ever do. I love how Tegan was like 0_o wow

aawww i love this. her voice sounds so cute and i think it fits

This is so adorable...

'..Holy crap, she's better than you..' made me laugh so hard

lmfaoo i loved this!

My crush on Tegan just got even bigger, lol.

awwwwwwwwwwwwwwwwwwwwwwww!! That was sssooooo cute!

"Holy crap she's better than you" ahaha God, I love them. I love how Tegan messed up the lyrics. It was cute.

Wow, this will probably be like the biggest moment in this girls life.

soooo freaking sweet!!!!!!!!!!

this makes me love Tegan more and more

i love it when tegan laughs and tells sara lena better then she is!SO CUTE!

around 2:43 or 2:44 is adorable cuz sara smiles at the lil girl

life is beautiful

this peformance is pricless. It is so cute. Lol Tegan " Holy crap shes better than you"

this video is so sweet!

"Holy crap she's better then you." Tegan will be the most amazing mum on the planet.

tegan is so attractive. i love how she is with lena. haha poor sara being kicked out :D

aww that was really cute :D

i love tegans face in this video

im soooooooooo jealous, and it's so cute :)

1:34-1:36 epic cuteness!!

xD Cute. =)

hahahaaaa! this is so cute! hey, way to start 'em early!! kudos to the rents! ;D

Awwwww! I wish I was that little girl! Thats so cool! And so cute!!! Tegan is gonna be an awesome mum! So will Sara =D their gonna me kick-ass/bad-ass mums =D

this is epic video i hope that they don't make it go away like james otto did with his youtube video as the only way they got out is by youtube love ya tegan and sara :)

Skip that 1:34-2:30!! Yess

haha when in doubt go to the chorus :)

sara just stops singing so that the little girl can be heard....aw....

DUDE. MY NAME IS LENA. WHY ISN'T THAT ME???????

My name is Leena. I feel fucking cool.

Holy crap, she's better than you... XD

HOLY CRAP SHES BETTER THEN U lol