Justin Bieber and Usher attend wedding in New York

Justin Bieber swapped his usual attire of baggy pants and a baseball cap for a smart suit to attend a wedding in upstate New York with his music mentor Usher.

The troubled pop star was among the guests at the wedding of Adam Braun, brother of the singer's manager Scooter, and former model Tehillah Voslevitz in Peekskill, New York at the weekend (24-25May14).

Pictures posted on Twitter.com show Bieber posing with the bride and groom, as well as his friend and mentor Usher, at the reception. Other guests included actress Sophia Bush, who posted snaps on her Instagram.com page and added in a caption, "Celebrated the beautiful love of (Braun) and (Voslevitz) last night... so happy for my soul brother and soul sister. What a love. What a night! #fate #meanttobe #congrats (sic)."