Selena was wearing a brown funnel-neck pullover, jeans, and black flats.
The newly blonde singer seemed to be camera shy as she ducked into her gaping turtleneck and hid behind her fringe bangs.
Her hair appeared to be pulled back in a low bun and she accessorized the look with a blue bag that hung from her right shoulder.
Justin was also casually dressed and wore a green bomber jacket over a pink T-shirt and grey sweat pants.
Following the service the Canadian superstar was seen playfully boxing with his friend Harry Hudson.