Olesya Yurivna Rulina (Russian: Oлeся Юрьевна Рулина; born March 17, 1986) is a Russian-American actress. She is best known for co-starring in all three films of the High School Musical franchise as Kelsi Nielsen. She also starred in the films Private Valentine: Blonde & Dangerous (2008), Flying By (2009), Expecting Mary (2010), and Family Weekend (2013). (Via Wikipedia)