Kelly Michelle Lee Osbourne (born 27 October 1984) is an English singer, actress, fashion designer, model, and TV personality. She is the daughter of Ozzy and Sharon Osbourne. She is known for her appearances on the reality show The Osbourne (2002–2005) with her family, for which they won a 2002 Emmy Award for Outstanding Reality Program.

Her debut album, Shut Up, was released by Epic Records in 2002, followed by her second album, Sleeping in the Nothing. In 2004, Osbourne launched her own fashion line, Stiletto Killers, with her friend and former sponsor, Ali Barone.

In October 2004, she made her debut as an actress with a starring role on the ABC teenage drama Life as We Know It, in the supporting role of Deborah Beatrice Tynan. In 2005, she played Wendy from Peter Pan in The Queen's Handbag and provided her voice for the animated film Live Freaky Die Freaky. Later that year, she became the face of the high street chain Accessorize. Osbourne co-hosted the 2006 edition of I'm a Celebrity...Get Me Out of Here! NOW!, a spin-off show of the main ITV program.

Her one-off gigs include the 2002 MTV Film Awards, Top of the Pops Saturday, MTV's Isle of MTV, MTV UK and Ireland's red carpet coverage of the 2003 MTV Europe Music Awards, Popworld, The Sunday Night Project, the 2005 MTV Australia Video Music Awards and Zane Lowe's BBC Radio 1 show.

In February 2006, Osbourne was a guest judge on S1:E4 of Project Catwalk on Sky1 then went on to host Seasons 2 & 3. In July 2007, Osbourne portrayed the role of prison matron Mama Morton in the musical Chicago for 7 weeks at the Cambridge Theatre. In autumn 2007, Osbourne signed to BBC Radio 1 to host the show, The Surgery.

In March 2009, Osbourne returned to TV with the rest of the Osbourne family on Osbournes: Reloaded. On September 1, 2009, Osbourne released her first autobiography, Fierce, via Virgin Books. In 2009, she competed on Dancing with the Stars, in which she and her professional dance partner Louis van Amstel took third place.

In September 2009, she started writing a weekly column giving advice and celebrity gossip in UK magazine Closer. In August 2010, Osbourne began filming the comedy Should've Been Romeo, her first major role. In December 2010, it was confirmed that Osbourne would star alongside Disney star Miley Cyrus in So Undercover.

In 2011, Osbourne became a fashion correspondent for the E! series Fashion Police, serving as co-host, with Joan Rivers. In June 2011, she hosted the Miss USA pageant, with Susie Castillo.

In 2012, she was a guest judge in season 4 of RuPaul's Drag Race, and hosted the New Now Next Awards. In August 2013, she was a guest judge on the 12th season of Project Runway, then a guest judge on the October 2014 premiere episode of Project Runway: Threads. She is also a regular judge on Project Runway: Junior.

She played the voice of Hildy Gloom in the Disney XD animated series The 7D (2014–2016).

In February 2015, she exited Fashion Police after complaints about her co-host's comments on the show. She replaced Dawn French as a judge on Australia's Got Talent for its 8th season on Channel Nine. In 2018, Osbourne joined her father and brother on a global tour documented in the series Ozzy & Jack's World Detour. In 2019, Osbourne competed in season two of The Masked Singer.