Crystal Harris is headed to Las Vegas this weekend to party her troubles away -- and it all came about because Heidi Montag invited her.
Sources close to Harris tell TMZ ... Heidi reached out to her shortly after the breakup with Hef to offer her moral support. Bottle blondes need to stick together!
The pair decided to spend what would have been Crystal's wedding day in Las Vegas. They couldn't just go to Sin City on the down low -- instead they are hosting a party at WET REPUBLIC pool at the MGM Grand Hotel & Casino.
So instead of wearing a wedding dress today, Crystal will be sporting a bathing suit. Men everywhere applaud the decision.