Reese Witherspoon is "madly in love" with her new pet pooch.

Reese Witherspoon's new dog (c) Instagram

Reese Witherspoon's new dog (c) Instagram

The 'Wild' star took to Instagram to show off the latest addition to her family, bull terrier Lou Ann.

She captioned the photo: "Drum roll please!!!! Introducing the newest member to our family #LouAnn !! #bullterrier #madlyinlove ... (just look at that face *sigh*) (sic)"

The 39-year-old star - who also has pooches Hank and Nash - regularly shares snaps of her pets on the photo-sharing site.

Writing recently, she shared with her four million followers: "Why my dogs [love] Sundays... BACON! #nash #hankthedog #doglife ...

"Haha! 😭😭😭I know the feeling. #dogobsessed (sic)"

Meanwhile, when Reese isn't taking photos of her dogs, she works hard to balance her career and family life, bringing up 16-year-old Ava and Deacon, 11 - who has from a previous marriage - and son Tennessee, three, who she has with Jim Toth.

Discussing parenting, she said: "No one's really doing it perfectly. I think you love your kids with your whole heart, and you do the best you possibly can.

"But, you know, right now I'm feeling sad missing my little 2-year-old, and my daughter's about to finish her freshman year of high school, and my son has a golf tournament this weekend that I hope I don't miss."