Kirsten O'Brien (born 23 February 1972) is an English television presenter, radio presenter, and stand-up comic. She is known for presenting SMart, and presented Smile and Totally Doctor Who alongside Barney Harwood on CBBC.
O'Brien studied media and communications at the University of Central England in Birmingham, graduating in 1993. She got her first broadcast experience on the university's student radio station which led to her first job in 1995 at Tyne Tees Television where she made her presenting debut on a children's science programme. In 1996 she joined the team presenting the continuity links during the BBC's children's programming CBBC. She stayed there for three-and-a-half years during which time she became best known for her partnership with arrogant puppet Otis the Aardvark. Both O'Brien and Otis also co-presented with other people (and often solo). The 1997 Saturday morning spin-off Saturday Aardvark was entirely built around them. Puppeteer Dave Chapman would often reduce O'Brien to tears of helpless laughter with his ad-libs.
The O'Brien dynasty were a royal dynasty who ruled Thomond, Ireland.
O'Brien is a common surname. See List of people named O'Brien.
O'Brien may also refer to:
O'Brien is a British talk show presented by James O'Brien. It was broadcast on ITV from 30 March 2015 to 10 April 2015.
The majority has been negative with Gerard O'Donovan of The Daily Telegraph describing the show as "low rent" and "disappointing".
O'Brien is a surname of Irish origin which has many variants in the Irish diaspora worldwide, such as O'Bryan, O'Brian, O'Briant, O'Brient, O'Bryant, O'Brine, O'Bryen etc., which all claim a general common ancestry with the original Gaelic surname being Ó Briain or Uí Briain. Notable people with the surname include: