Which couple has a better chance?(celebs in love)

Trista and Ryan sidestepped the reality-show breakup trend by staying together--and it now seems that Andrew and Jen might be in it for the long haul too. Which pair has the best shot at lasting love? We size them up.

 
              TRISTA AND RYAN      ANDREW AND JEN      EXPERT OPINION 
 
BACKGROUND   Both come from       California native   "Couples who come 
 LOW-DOWN    middle-income        Andrew comes from   from similar 
             families. She grew   mega money (he's    backgrounds have 
             up in a Saint        the grandson of     more in common 
             Louis suburb; he     tire magnate        and usually get 
             hails from the       Harvey              along better," 
             town of Fort         Firestone); Jen,    explains John 
             Collins, Colorado.   who's from Ohio,    Molloy, Ph.D., 
                                  has middle-class    author of Why Men 
                                  roots.              Marry Some Women 
                                                      and Not Others. 
 
 SHACKING    No. Trista has an    Yes. Jen moved to   The rate of 
   UP?       apartment in Los     San Francisco and   divorce is about 
             Angeles, and Ryan    is living with      50 percent higher 
             is still living in   Andrew in his       among couples who 
             Vail.                apartment.          live together 
                                                      before marriage," 
                                                      says Larry 
                                                      Bumpass, Ph.D., 
                                                      professor of 
                                                      sociology at the 
                                                      University of 
                                                      Wisconsin. 
 
 TERM OF     About eight          Undetermined.       "Not setting a 
ENGAGEMENT   months. Ryan         They got engaged    date can be a 
             popped the           on May 18, but      sign that one 
             question on          don't seem to be    person isn't 
             February 19, and     in a hurry to       ready to commit," 
             ...