- After uploading her first demo tracks to community website MySpace.com in November 2005, she became an overnight sensation in the UK.
- "Alfie", the final track on "Alright, Still" is about her brother, the actor Alfie Allen.
- Attended "Bedales School" with Natalia Tena, the same school which Minnie Driver and Daniel Day-Lewis attended.
- Romantically linked with American actor David Harbour. [October 2019].
- Lily and her sister, Sarah Owens, are co-owners of "Lucy in Disguise", a vintage clothes shop in London's Covent Garden neighborhood.
- Suffered a stillbirth, a baby boy named George, 6 months into her pregnancy in late October 2010, with her then boyfriend (now ex-husband) Sam Cooper.
- Has two daughters with her ex-husband Sam Cooper - Ethel Mary Cooper (b. November 25, 2011) and Marnie Rose Cooper (b. January 8, 2013).
- Her former stepfather, Harry Enfield, based characters "Kevin" the neurotic teenager on Lily's elder sister, Sarah. Also, the baby characters "Harry" and "Lulu" from the Harry Enfield and Chums (1994) show were based on Lily and Alfie when they were youngsters, the only difference was the reversal of the genders. The "babies" were played by Harry and Kathy Burke.
- Announced at her wedding reception, held at her £3 million 17th century country mansion, that she is 16 weeks into her third pregnancy; her second by new husband Sam Cooper (11 June 2011).
- Suffered a miscarriage 2 months into the pregnancy with ex-boyfriend Ed Simons (18 January 2008).
- Her single 'Smile' went to #1 for two weeks in the UK singles chart in 2006. Her album 'Alright, Still' debuted at #2 in the UK album charts.
- Was voted the third coolest person of the year on the Cool List of "NME" magazine, but also ranked #10 in BBC3's The Most Annoying People of 2006 (2006).
- Married fiancé 'Sam Cooper at St. James the Great Church in Cranham, Gloucestershire, wearing a vintage 1920s lace gown designed by Chanel. The couple arrived at the church in a dark green Bentley and Allen's bridesmaids included her best friend Miquita Oliver.
- Has a younger brother Alfie Allen, and an older sister, Sarah Owens (born in 1980).
- Supporter of Fulham Football Club (English Premier League soccer club). Fellow fans include Elizabeth Hurley, Pierce Brosnan, Hugh Grant, Hugh Laurie, Benicio Del Toro, Daniel Radcliffe, Andrew Johnston and the late Michael Jackson.
- Was 5 months pregnant with her daughter Ethel when she completed penning songs for the West End musical production of Bridget Jones's Diary (2001).
- Is the daughter of Keith Allen and Alison Owen.
- Her father is Welsh. Her mother, who is English-born, has Welsh, English, and Irish ancestry.
- Announced her engagement to Sam Cooper, having been in a relationship with him since July 2009, after he proposed to her on their hotel room balcony in Bali on Christmas Day (28 December 2010).
- Her ex-husband, Sam Cooper, is a painter and decorator.
- Scooped three nominations for the 2007 Brit Awards including "British Female Solo Artist", "British Album" and "British Breakthrough Artist" (16 January 2007).
- Returned to work 5 months after giving birth to her daughter Ethel in order to begin working on her 3rd studio album.
- Niece of Kevin Allen.
- The music video to "Smile" showed a young lady paying her friends to ransack the flat of an annoying ex-boyfriend while she met him for a coffee and spiked his drink with laxatives.
- Has a half sister Teddie who was born in 2006.
- Former stepdaughter of Harry Enfield.
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