"I said, 'That's the best Instagram I've ever seen in my life," Loughlin tells PEOPLE

By Patrick Gomez
Updated March 09, 2015 04:10 PM
Credit: Courtesy John Stamos

It would seem one of the many people who “liked” John Stamos‘s Full House Instagram photo this weekend has emerged: former costar Lori Loughlin!

“He called me Friday, and I’d just seen it,” Loughlin tells PEOPLE of Stamos. “I said, ‘That’s the best Instagram I’ve ever seen in my life!”

Loughlin says she was “howling” with laughter after seeing the photo of Stamos standing just feet away from unsuspecting fans who were staring at the San Francisco home that was used for exterior shots on the ABC sitcom.

“I thought it was so, so, good,” continued the actress, 50, who was still giddy about the photo. “It’s so good! It was so good!”

Although Stamos went undetected while taking the photo, Loughlin says she still gets recognized constantly from her days playing Stamos’s wife.

“It’s lovely. I only have fond memories and thoughts, and love that show, the cast and the whole experience,” says the actress, who stars in the second season of Hallmark Channel’s When Calls the Heart beginning April 25. “I’m really proud that the show has lived on in syndication and many generations have grown up watching it. I’m really proud of that.”