Celebrity hairstylist Kylee Heath used Iles Formula Haute Performance Finishing Serum, $44, before and after blow-drying to create polished-yet-beachy waves.
In case you needed a reminder that platinum hair looks amazing with red lipstick, here's J-Law.
Warm lowlights add dimension to McAdams' icy blonde hair.
Cunningham took the red-haired starlet to a bright, white shade of blonde. (Side note: Stone and Swift are totally #twinning.)