Josh Groban is still “The One That Got Away” for Katy Perry. Perry posted a TikTok on Monday mourning the news that Groban, whom she briefly dated in 2009, was engaged to British actress Natalie McQueen. In the video, Perry, who was wearing a white bathrobe, poured herself a full glass of what appeared to be Champagne and took a sip as she jokingly cried over the engagement news. Katy Perry shared a TikTok reacting to her ex Josh Groban’s engagement to Natalie McQueen. Perry drank alcohol and jokingly cried to her song “The One That Got Away,” which is about Groban. Perry’s 2011 song “The One That Got Away” — which is about Groban — played over the video. The pop star gave the newly-engaged couple her best wishes by captioning the post “congrats” with a champagne emoji. Perry’s post about Groban got a big reaction from fans in the TikTok comments.…