The Hills, will join Peter Griffin and his dysfunctional family for a one off episode.
She will play the date of the Griffins' family dog Brian, who uses Lauren to disguise his true affections for a mystery character.
Promo shots for the episode also reveal that Conrad’s former co-star Whitney Port will also make a cameo appearance in the series.
The episode is due to air on 3rd May 2009 in the US.

Watch the FIRST episode of Season 5 from the 27th of April at mtv.co.uk/hills