Khloe Kardashian says while sister Kim Kardashian is dating rapper and longtime friend Kanye West, their relationship isn't serious yet.

"I don't think it's serious. I think it's too soon," the Khloe & Lamar and Keeping Up with the Kardashians star told Watch What Happens Live host Andy Cohen during a Sunday night appearance on the Bravo talk show, according to Us Weekly.

"But because they've been friends for so long, it's just so easy and that's something I love seeing for Kim -- the easiness and how happy she is. And it's just more of a great friendship and friendships make the best relationships."

Reports Kim has a new boyfriend following her October 2011 split from former husband Kris Humphries -- whom she was married to for only 72 days and is currently divorcing -- first surfaced when she and West were spotted together in New York City earlier this month and seen catching a movie and enjoying lunch.

The couple -- already reportedly nicknamed "Kimye" -- has since been seen shopping, eating ice cream and having dinner together with the entire Kardashian clan.

"We've known Kanye for like nine years, and we had a double-triple-foursome date," Khloe reportedly told Cohen about her Saturday public outing with Kim and West.

"He's great with the family, but again we've known him for so long. It's not like some stranger getting into a hurricane."

Khloe is apparently a bigger fan of West than she was of Humphries, whom she claimed "rubbed her the wrong way," when it comes to matters of Kim's heart, according to Us.

West will reportedly be making appearances on the upcoming season of Keeping Up with the Kardashians despite Kim's recent claims she "wouldn't have another relationship shown on the show" because it "might be too personal."