Khloe Kardashian Defends Kylie Jenner and Tyga's Relationship: I Was Probably F**king Guys in Their 20s at 16

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Just weeks before her sister Kylie Jenner's 18th birthday, Khloe Kardashian is opening up about her sibling's relationship with 25-year-old rapper Tyga.

In a new (bootylicious) spread for Complex magazine, the 31-year-old Keeping Up With the Kardashians star says she doesn't see a problem with her sister dating an older guy.

"I think at 16 I was probably f**king someone that was in their 20s, for sure," Khloe confessed. "I wouldn't say I was even dating, probably just sleeping with them. But again Kylie is not a normal 17-year-old."

WATCH: Khloe Kardashian Hugs It Out With Kylie Jenner and Tyga

Khloe adds that her 17-year-old sister isn't your typical teenager. "You're not gonna say, 'Hey, so what are you doing this weekend?' and have her say, 'Having a slumber party at my girlfriend's,' or 'Going to prom.' That's not what Kylie does," she said. "Kylie is taking business meetings and bought her first house, or she’s going on a private plane with Karl Lagerfeld to take a meeting. That's not even what people do in their 30s. It's a rare circumstance, so let’s treat this as a special case."

PHOTOS: Kylie Jenner Wears the Most NSFW T-Shirt Ever in Latest Snapchat

Continuing to defend her little sis, Khloe also commented on the controversy surrounding Kylie's big lips.

"Sometimes things bother her. When it comes to her lips, I knew it was one of her biggest insecurities. She used to always take pictures covering her mouth," she recalled. "I didn't even know when she first did her lips. It wasn't noticeable, then it started getting bigger and bigger. I guess that was something she just wanted. I always wanted a boob job and I wear a padded bra all the time."

WATCH: Khloe Kardashian Pulls a 'Kylie,' Check Out Her Much-Fuller Lips

Khloe never got a boob job -- she says her father, the late Rob Kardashian, discouraged it when she was 18 and he died shortly after -- but she's not opposed to plastic surgery altogether. "I'm all for stuff if it's for you," she said. "If you want to get plastic surgery, I'm for that, but getting your lips filled in, that's temporary, too."

The magazine goes on to call out how quick Khloe is to defend her family. "I am a lion and these are my cubs," she declared. "Don't f**k with my cubs 'cause I will rip your head off."

WATCH: Khloe Kardashian Slams Rumors of Cocaine at Kendall & Kylie Jenner's Graduation Party

While Kylie just had her grad party, complete with a twerking Khloe, she'll soon be gearing up for an 18th birthday bash!

The youngest Jenner sister recently revealed to ET her plans for the monumental day on Aug. 10. "I think I'm gonna go on a trip with my friends," she said. "Do something fun!"

Will Tyga be there? Check out the two arriving to Daily Mail's Seriously Popular Yacht Party in Cannes, France this past June:

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