Helen Nelson, better known professionally by her stage name Oviya, is an Indian actress who works in the Tamil and Malayalam films. She made her breakthrough as an actress in Sarkunam's rural romantic comedy Kalavani (2010), before appearing in other films including Pandiraj's Marina (2012), Moodar Koodam (2013) and Madha Yaanai Koottam (2013). Oviya has also enjoyed box office success through her roles in Sundar C's Kalakalappu (2012) and the horror comedy Yaamirukka Bayamey (2014). In 2017, Oviya appeared on the reality series Bigg Boss Tamil 1.

Kalakalappu (transl. Humour) is a 2012 Indian Tamil-language comedy film directed by Sundar C. and produced by his wife Khushbu. It stars Vimal, Shiva, Santhanam, Anjali and Oviya and with music composed by Vijay Ebenezer. It was originally titled Masala Cafe, but was later renamed to Kalakalappu. The film released on 11 May 2012 to positive reviews, and became a commercial success. The film is 25th directorial venture for Sundar. The film was remade in Telugu as Jump Jilani. In 2018, the film had a spiritual successor Kalakalappu 2. The film is loosely based on the 2009 German film Soul Kitchen.