The preview features a brief voiceover of the moment that Humphries said, 'Will you marry me?' against a black background.
It also implies that the New Jersey Nets star spoke about his plans to propose in a conversation with Bruce Jenner.
Kardashian and Humphries confirmed their engagement at the end of last month, revealing that Humphries popped the question by writing 'WILL YOU MARRY ME?' in red rose petals.
"We are all so excited for the new season," wrote Kim on her official website, alongside the promo video. "So many amazing things have happened this past year and I can't wait for you all to see what we've been up to."
Kardashian's sister Khloe also shared her excitement at the upcoming sixth season on her own blog, teasing: "OMG this season is going to be insaaaaaaane - seriously so much happens. It's nonstop silliness and of course my family is always bringing the drama LOL. Wow. I can't wait for the premiere! (sic)"
Keeping Up With The Kardashians premieres Sunday, June 12 at 10/9c on E!.
> Kris Humphries knew Kim Kardashian was 'the one'
Watch the video preview for Keeping Up With The Kardashians below: