Kristin Cavallari has adopted a new puppy.

The 30-year-old star already has two sons; Camden, five, Jaxon, three, a 23-month-old daughter called Saylor, a German Shepherd mix and a Yorkie with her husband Jay Cutler, but the couple have decided to add yet another furry friend to their family.

Taking to her Instagram account, the blonde beauty uploaded a photograph of her new addition sitting beside her German Shepherd Bane and wrote: ''Added another living thing to the Cutler crew because yes, we have lost our minds,'' followed by the hashtags, ''#TrainedKiller' and '#DontMessWithThisCrew. (sic)''

The fashion designer has always been very open about the fact she has a weakness for dogs and even uploads pictures of her fur babies on her social networking sites.

Her love for canines is so strong that she even based her daughter Saylor's name on a dog she had met and fell in love with while on a walk before she was born.

She said: ''I loved her dog's name ... funny enough, it was the name she had picked out if she had a girl, but she had boys, so she used it for her dog instead.''

Meanwhile, Kristin recently admitted that her relationship with Jay - who she married in 2013 - takes a lot of ''effort'' and believes the key to success is to miss each other.

She said previously: ''I have always said: it's kind of nice to miss each other. I think that's how we've always kind of kept our spark alive.

''Jay just signed with the Miami Dolphins, so he's in Florida. Some days it's crazy and I can't wait for bedtime and other days I'm like, 'Okay, it's actually not that bad.'

''Honestly, I think communication and it's so much easier said than done. I know that Jay and I have to make a conscious effort. You have to put in work for a relationship. You can't just get complacent and lazy. You have to still value and appreciate the other person. I think that when you don't that's probably when you start to get in trouble. And, I mean, we have our issues. Our relationship isn't perfect. But we love each other and we work on it and we make a conscious choice to work on the relationship and I think that that's what you just have to do.

''God, I'll be the first to admit it - especially with three little kids - it's hard. You have to make time for each other and try to get out of routine here and there. It's much easier said than done. It really is difficult sometimes.

''We have a lot of great tools that we learned from therapy and I think that was the most beneficial part. Just learning how to communicate and walking away with some great tools, which we'll always be able to use.''