Find out which on-again, off-again couples are best paired off
AnnaLynne McCord and Kellan Lutz
The 90210 actress and New Moon vampire are heating up again. McCord, 22, and Lutz, 25, were spotted running a triathlon in Puerto Rico and held hands at L.A.'s STK in March. "They're always off and on but lately are more on," says a pal of the pair, linked since 2008. "They love hanging out."