- Is best friends with her 2 Broke Girls (2011) co-star Beth Behrs.
- Youngest of five children. Father is a molecular pharmacologist. Mother is a poet and speech therapist. Both are Jewish.
- Took piano lessons for her role as Sloane in Raise Your Voice (2004).
- One of her big passions in life is writing. In 2009, Kat co-wrote a screenplay with her brother.
- Her first acting job was appearing in a potato chips commercial for Orleans low fat crisps.
- After getting four aces during a poker game with Jennifer Love Hewitt and Jennie Garth, Kat got the poker name, "Four Aces Dennings.".
- Kat, who portrays Bob Saget's oldest daughter on Raising Dad (2001), was born on the same day and in the same year (June 13, 1986) as Mary-Kate Olsen and Ashley Olsen, who portrayed Saget's youngest daughter on Full House (1987).
- Her favorite television series: Smallville (2001), South Park (1997), The Osbournes (2002), Absolutely Fabulous (1992), Roswell (1999), Dawson's Creek (1998), Neighbours (1985), That '70s Show (1998), The Simpsons (1989).
- Named as one of the "most desirable" famous women for 2013 in Ask men's list of top 99 "most desirable" women.
- Is good friends with Evan Rachel Wood.
- For her movie Nick and Norah's Infinite Playlist (2008), Kat was nominated for a Satellite Award in the category Best Actress in a Motion Picture, Comedy or Musical in 2008 and an MTV Award for Breakthrough Performance Female in 2009.
- Kat loves all animals and can't pick a favorite. She also loves Shojo Manga.
- She performed the song "If You Want To Sing Out, Sing Out" in Charlie Bartlett (2007).
- Kat is 5' 4½" (164 cm) tall. She has dark brown hair and blue eyes.
- When she has time away from work, Kat likes to video blog. She even did one for the Nick and Norah's Infinite Playlist (2008) DVD.
- Her mother, Ellie Judith Litwack, is a poet and speech therapist while her dad, Gerald J. Litwack, is a molecular pharmacologist, biochemist, and former Associate Dean for Scientific Affairs at Thomas Jefferson University. Kat is the youngest among five siblings.
- Most of the characters she plays tend to be "rebellious daughters" around 15 or 16.
- Ranked #97 on Maxim magazine's Hot 100 Women of 2012 list.
- Ranked #55 on Interview magazine's Hollywood faces to watch "Future Stars of Tomorrow".
- She was originally cast as Laynie Hart on Everwood (2002), but the role was recast for unknown reasons. It later went to Nora Zehetner.
- Ranked #30 in Ask men's top 99 "most desirable" women of 2012.
- Ranked #16 in People magazine's "25 Beauties (and Hotties) at 25" list in 2011.
- In May 2021, Dennings has been announced her engagement to Rock Singer Songwriter Andrew W.K..
- Kat is ranked No.33 in AIM.com's "100 Celebs Under 25." She has also been listed among Moviefone's Hottest 25 stars under the age of 25.
- (February 15, 2021) On the Ellen DeGeneres Show she mentioned & showed video of her cat Millie and said she is considering getting another cat.
- Of her family members, she has a mother named Ellie, a father named Gerald, a brother named Geoffrey, and a sister named Debbie.
- Her cat, Millie sadly passed away in October 2023. She was 10 at the time.
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