Ashley Tisdale 100%, She had done most of all of them.
She is busy with Three New Movies (Picture This, You wish en HSM 3), Has the best sold Solo Album out of All High School Musical stars, has a Music dvd out, Busy with a new Album, He Said She Said was Number 1 on TRL, Mall Tour, Her own Disney Show and Much More..
And is a great Role Model for Everyone,

And Rihanna, she is Famous for like Three Years.?

Rihanna-she really came into her own this year and brought something fresh to her career.

A second place finish would be Shia La Beouf.

Both of them have shown they are not one hit wonders or tied to a namebrand that will give them a short shelf life-they are in it for the long haul.

zac

rhianaaaaa definitly
then zac
then ashley
then hayden

Shi LeBeouf is #1 def!!!!!!!!!! he is so HOTTTT!
then hayden(I MET HER 3 TIMES!!)
then ahley........i think she is pretty talented
then rihanna...she is kinda revealing and it is grossing me out!!
then zac (no comment if i were to say anything it would me too mean......keeping my words to my self!)

oh please if anyone here thinks ashley tisdale should be one of the hotties under 25, then clearly you have your head stuck up her fat ass, is can't act, sing, dance or do anything that is worth remembering, as far as i am concern RIHANNA is the best out of all of them, and i know for a fact she has at least 2 as much awards than zac, ashley, hayden and shia combine, "umbrella" is my number one song/video, last year i thought "sos" was the best, but RIHANNA keep blowing me away with smash hits, i wouldn't be surprise if RIHANNA first single for her next (4th) album would be better than "umbrella", is the the best, way better than beyonce, p.s is chris brwon on the list because ho is smoking hot, RIHANNA and chris brown should totally hook up.

ZAAAAAAAAC!!!! Zac Efron is so hot

I don't think Zac is hot ... i actually don't see anything attractive in him! .. he looks ugly :|

Hayden Panettiere and Rihanna are the best :)!

i think hayden and rihanna are the best ashley is ok but shia is just sooooooooo ugly and zac is fit and sooooooooooo cute.

zac he rock!

They all really desever it!! Well done to them!

i think vanessa hudgens better then ashley tisdale even through vanessa had nude pic out it wasnt realy vanessa fault someone sended it on internet and she apoligze of it as well. after this happen i still think vanessa is a good role model and way way pretty then ashley and some celebrities.
i like her even through she did thunderbirds,thirteen and guests in progammes,high school musical,album is more famous then her high school musical and she got the offer of singing before ashley and corbin. she came on lots of interviews,photoshoot,premires and different channel.some progammes use her songs for advertising or beginning of the progamme there use her songs. vanessa doesnt care about or frame she is doing it she wanted to do this when she was little kid and this was her dream.she had own tour and met her fans. ilike her fashion and i like everything she does.
second option is zac feron he is cute and i really like him.him and vanessa both have talented that noone can miss it. zac been lots of progammes and interview and moves and photoshoot. zac is way better then some celebrities even better then jesse mccartney. there both tired hard this year and every year and worked hard.even vanessa trying out new movies and her new album is releasing soon.zac got new movie coming out and he doesnt want to sing yet but goes if he does he will surpise us. i like his fashion and everything he does.
then rihanna i aboustely love her fashion and her songs.Hayden Panettiere she is good actress and pretty.

i dont think zac is hot . hes kind of ugly he has the most ugly eyes i mean really look at him lol

so rihanna and hayden . i love rihanna's songs and im a total heroes freak

Hello people MILEY CYRUS should be on that list she is so adroable & talented!!