Season 5 of The Hills kicks off as Lauren gets the ultimate surprise when Stephanie brings Heidi to her birthday party. Realizing that their friendship may never be what it once was as long as Spencer is still in the picture, will that keep Lauren and Heidi apart for good? Heidi thought Spencer was ready to grow up when he called off their quickie marriage to give her a dream wedding. But when a guys’ night out ends with Spencer hitting on a beautiful bartender and beating up his sister’s ex-boyfriend, Heidi must ask herself once and for all – is Spencer the guy that makes her happy, or simply the cause of all her problems?