Kylie Jenner Booed, Blac Chyna's BET Awards Diss: Tyga's 18th Birthday Engagement, Baby Mama Jealous?

Kylie Jenner finally celebrates her 18th birthday on August 10. Will rapper boyfriend Tyga surprise the "Keeping Up With The Kardashians" beauty with a shocking b-day proposal? Jenner's young romance with the "Rack City" emcee continues growing strong, but (ex) baby mama Blac Chyna just won't stop pestering the aspiring model!

Chyna attended the BET Awards on Sunday (June 28) alongside bootylicious BFF, Amber Rose. Jenner ultimately missed the show, which sort of upset the former hip-hop vixen. But it's not like she wanted to call a truce with the brunette bombshell. Chyna actually wanted to watch her crash and burn!

An alleged HollywoodLife.com insider reveals:

"Kylie knew better than to show up to the BETs... This is a non-Kardashian atmosphere, and all of them knew that. They would have been booed so badly and forced to leave, so they used their brains and spared themselves the embarrassment. But Blac would have loved if Kylie was here. She would have got her life hearing that girl being booed to death!"

Really - is Chyna so obsessed with a potential Jenner downfall?

Well, right now, Kim Kardashian's little sis is working her own way to the top. Jenner didn't attend the awards show because she's too busy with another personal project:

kyliejenner: "project for the next 2 days."

Wonder what that could mean? Maybe she's redecorating her new home, or preparing for yet another epic photo shoot...

Meanwhile, the 25-year-old "Faded" superstar performed a stellar rendition of "Ayo" and "Post By Me" alongside Chris Brown and Omarion:

Should the YMCMB singer pop the big question once Jenner turns of-age this summer? Some Twitter fans are intrigued by the thought:

@KimberleePonder: "lol @ Kylie Jenner getting engaged at age 18 & I can't even get a text back ;)."

@TalktoMina: "Kylie Jenner and tyga engaged... who will walk her down the aisle now she has two moms?"

@evianwordflu: "Can't wait 'til Tyga and Kylie Jenner get engaged, so Jaden Smith can hit Tyga with the Ray-J "I hit it first" move."

Stay tuned!