! ▁as ▁Sh a una ▁Ke aton , ▁alongside ▁Cor bin ▁Ble u ▁and ▁Ke ke ▁Pal mer . ▁In ▁ 2 0 0 7 , ▁she ▁played ▁a ▁small ▁role ▁in ▁Super ▁S weet ▁ 1 6 : ▁The ▁Movie . ▁Her ▁biggest ▁and ▁most ▁well - known ▁role ▁to ▁date , ▁however , ▁has ▁come ▁from ▁her ▁rec urr ing ▁role ▁as ▁Am ber ▁Add ison , ▁a ▁sn ob by ▁popular ▁mean ▁girl ▁and ▁f ren emy / rival ▁of ▁main ▁characters ▁M iley ▁Stewart ▁and ▁L illy ▁Tr usc ott , ▁on ▁the ▁m ega - success ful ▁Disney ▁Channel ▁television ▁show ▁Hann ah ▁Mont ana , ▁appearing ▁in ▁all ▁four ▁seasons ▁of ▁the ▁show ▁during ▁its ▁run ▁from ▁ 2 0 0 6 ▁to ▁ 2 0 1 1 . ▁▁ ▁In ▁ 2 0 1 5 , ▁she ▁star red ▁as ▁T ich ina ▁Arnold ▁in ▁the ▁L if etime ▁bi op ic ▁Sur v iving ▁Com pton . ▁Know les ▁appeared ▁as ▁a ▁rec urr ing ▁character , ▁Sim one ▁B urch , ▁on ▁the ▁long - running ▁CBS ▁soap ▁opera , ▁The ▁Young ▁and ▁the ▁Rest less ▁in ▁ 2 0 1 8 , ▁and ▁also ▁co - star red ▁in ▁the ▁Free form ▁television ▁film ▁Life - Size ▁ 2 ▁in ▁December ▁ 2 0 1 8 ▁opposite ▁Ty ra ▁B anks ▁and ▁Francia ▁R ais a . ▁ ▁Personal ▁life ▁Despite ▁numerous ▁reports ▁and ▁sharing ▁the ▁last ▁name , ▁she ▁has ▁stated ▁that