no. the cw has oth for a 7th season.
as far as i know, most of the charcters/actors will be back next season. chad is negotiationg right now, because apparently he wants to be in s7. and so i think if he signs on hil might too, because then their storyline for her may change into something she likes. :)
They have renewed the show for season 7, but it is unclear if chad or hilary are coming back.
I also read on wikipedia that the cw has renewed it up to season 10