They've had to deal with tiffs, tabloid rumours and very public falling outs, but despite all the odds against them these celebrity couples, from David and Victoria Beckham (pictured) to the Osbournes, have made it through the years.  As the likes of Britney and K-Fed and Paris and Benji hit the curb, we take the time to appreciate the celebs that are in it for the long-haul this Valentine's Day.