Alexander Leonard O'Neill, known as Alexx O'Nell, was born on July 26, 1980. He is an American actor and musician who has made a significant mark in the Indian film industry. O'Nell was previously married to actress Sweta Keswani in 2007, but the couple divorced in 2011. He has also been in a relationship with Shama Sikander from 2011 to 2015. Standing at a height of approximately 6 feet (183 cm), O'Nell hails from Connecticut, USA, and is the son of a Dutch mother and an Irish-American father. He has one sister. 

Alexx O'Nell's career began in community theater in the United States before transitioning to television advertisements and films in India. He gained recognition for his roles in various films such as "Ae Watan Mere Watan," "Khufiya," "Golondaaj," "Roohi," and "Aarya." His breakthrough came with the Hindi film "Cheeni Kum" (2007) and the English film "Loins of Punjab Presents" (2007). O'Nell also participated in the popular Indian dance competition "Nach Baliye" in 2007, where he showcased his dancing skills alongside his then-girlfriend Sweta Keswani. Throughout his career, he has appeared in numerous films and television series, earning praise for his performances and establishing himself as a prominent figure in the industry.