Hugh Hefner and Crystal Harris
06/20/2011 AT 06:30 PM EDT
One day after partying in Las Vegas
on her would-be wedding day
, Crystal Harris paid a visit to her ex, Hugh Hefner.
"Crystal came by to see how I've been doing," Hefner, 85, Tweeted
on Sunday. "We remain close friends."
Harris, 25, who enjoyed poolside time
with fellow blonde Heidi Montag
over the weekend, didn't show up empty-handed.
"Crystal brought Charlie back because she thinks he's happier here," the Playboy
mogul wrote of the doggie the couple once shared. "I appreciate it, because I really missed him."