AceShowbiz - Maybe Justin Bieber was too focus on his fiancee Hailey Baldwin that he forgot to zip up his fly. The 24-year-old singer and the 21-year-old model were spotted having a post-church dinner as they were heading to a restaurant in Beverly Hills on Wednesday night, August 29 after the Churchome 8 P.M. Saban Theatre service.

Justin and Hailey were seen in good spirits as the former flashed a thumbs-up sign at the paparazzi, seemingly unaware of his wardrobe malfunction. The "Despacito" hitmaker donned pot leaf-printed blue shirt, backward baseball cap, navy pants which he paired with a pair of Vans sneakers.

His fiancee, meanwhile, dressed down in a pink-and-white big jumper. She styled her blonde tresses in a messy bun while completing her look with white boots.

In addition to his wardrobe mishap, the Canadian star stole people's attention with his mustache. The "Love Yourself" singer's fiancee previously got him to shave his facial hair earlier this month. However, it seemed like it was back, looking full as ever.

Later that night, Hailey posted on Instagram a snap of Justin at Mastro's Steakhouse. He was seen leaning his body against a wall while holding a cup of drink in one of his hands. Judging by the photo, the singer seemingly was aware of the mishap at some point during their dinner as he zipped things up already.

The lovers are reportedly planning their wedding, which is said to be held next year. Justin allegedly was leaving "the bulk" of the wedding decisions up to her. "But, he's definitely engaged in the process and giving her feedback on things when she wants it," said a source close to the "Despacito" hitmaker.

It seems like their wedding will be a simple one as "neither Justin nor Hailey want a flashy showbiz type wedding." The insider added that the young couple wanted "the day to be about them and their love for each other, and not just a huge celebrity packed party."