Justin and Hailey Bieber's son Jack Blues Bieber dressed up as his dad in his pop star heyday for his Halloween costume this year. See photos, here.

Sydney Sweeney made a surprise on-stage appearance during Diplo's Honkey Tonk at Stagecoach on April 25. The actress wore a pale blue corset over a frilly miniskirt.

Taylor Swift wore a matching plaid skirt set to a date night with Travis Kelce on September 14, following her secret appearance at the Kansas City Chiefs game at Arrowhead…