Svetlana "Seka" Piljikić (née Aleksić, Serbian Cyrillic: Сека Алексић; pronounced [sɛ̌ːka ǎlɛksitɕ]; born 23 April 1981) is a Serbian pop-folk singer. Aleksić started performing in kafanas and discothèques at the age of fourteen, before signing to Grand Production in 2002. The following year, she gained significant success upon the release of her second album Balkan, which included hits such as "Crno i zlatno". Her 2007 release, Kraljica, was sold in 300,000 copies and remains one of the best-selling albums by a Serbian artist. She has also held two concerts in Belgrade Arena in 2010 and 2018.
Additionally, she had a minor movie role in We Are Not Angels 3: Rock & Roll Strike Back (2006) and starred in her own reality show, titled Moja desna ruka (2010).
Aleksić married Veljko Piljikić in 2010, with whom she has two sons; Jakov (b. 2016) and Jovan (b. 2020). She alongside her family resides in Stara Pazova, Serbia.