In her recent Health magazine cover story, the Keeping Up with the Kardashians star, 37, responded to a question about whether she goes to different sisters for different things. In addition to Kourtney, Khloé's siblings include Kim Kardashian West, Rob Kardashian and Kylie and Kendall Jenner.
"It depends on the stages that the other siblings are in, in their lives," the Good American mogul said. "For example, Kourtney is so loved up right now, she's probably not the one I'm going to go rave with. You know what I mean?"
She continued, "So, it really depends. But the older I get, the more and more I realize what an incredible relationship I have with each one of my siblings. It's totally cheesy, but I am so in love with each one of them."
Kourtney, 42, and Barker, 45, first publicly confirmed their relationship on Valentine's Day. However, sources told PEOPLE in January that they had already been dating "for about a month or two."
At the time, another source said the Blink-182 drummer had received the stamp of approval from Kourtney's famous family.
"He's liked her for a long time and she just got more open to the idea. He's a good guy and a really great dad," an insider said. "Her family and friends all really like him. Their kids all get along too, which is sweet."
Kardashian and her ex Scott Disick co-parent their three kids: sons Mason, 11, and Reign, 6, as well as 9-year-old daughter Penelope. The pair ended their nine-year relationship in July 2015.
Jeff Kravitz/Getty Travis Barker and Kourtney Kardashian
RELATED GALLERY: Kourtney Kardashian and Travis Barker's Sweetest Photos Together
Barker, meanwhile, shares stepdaughter Atiana, 22, daughter Alabama, 15, and son Landon, 18, with ex-wife Shanna Moakler, whom he was married to from 2004-08.
Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
Throughout their relationship, Barker and Kardashian haven't shied away from showing their affection for one another on social media.
Last month, the musician declared he wanted to laugh with Kardashian "for the rest of my life," after the mom of three shared a series of memories to Instagram, including a clip of the couple holding hands at a table.
The Poosh founder responded, "my whole life."