Katy Perry donned the thematic hue in the form of a lace and leather Tadashi Shoji creation, while co-star Jayma Mays opted for pink and orange.Hollywood saw blue this weekend, as the stars of Smurfs 2 hit the red (er...blue) carpet for the film's premiere in Los Angeles.
Ashley Tisdale sported blue as well, appearing in an affordable ($169!) Bless'ed are the Meek dress for a Hub Network summer party.
While blue was certainly trending, our favorite look from the weekend was a white, embellished Temperley London frock, worn by Anna Kendrick at the Dizzy Feet Foundation's Dance Gala.
Want to see the rest of this weekend's best looks? Click through the gallery!