Elena Sergeevna Katina (Russian: Елена Серге́евна Катина pronunciation: Yelena Sergeyevna Katina), born October 4, 1984, better known as Lena Katina, is a Russian singer and songwriter who is best known for her work with Russian duo t.A.T.u. She started her career at the age of eight, joining the Russian children's act Avenue, then not long after Neposedi. In 1999, Ivan Shapovalov had chosen Katina for his project, t.A.T.u., as well with Yulia Volkova. The duo would later become Russia's most successful pop music act. The group produced several hits including "All the Things She Said", "Not Gonna Get Us" and "All About Us".

In 2009, Katina began a solo career, which led t.A.T.u. to go into a hiatus. In 2011, Katina and Volkova officially split to pursue solo careers. That year, Katina released her first mainstream single "Never Forget", which in 2011 reached No. 1 on the MTV Russia Top 10 and also won the MTV Russia - 2011 Video Of The Year. The track also reached No. 1 on the US Billboard Hot Dance Club Play and reached No. 1 in Greece.