Credit: Chelsea Lauren/WireImage

All in the family?

Kourtney and Khloe Kardashian were "totally surprised" when Kim told them she was engaged to NBA beau Kris Humphries.

But Humphries' proposal last Wednesday wasn't a shock to Kris Jenner. "I knew it was going to happen because he had shared that with me. So I had a dinner right after," she explained to Us Weekly at a press conference on Wednesday for Keeping Up With The Kardashians.

"None of [the rest of] us knew," Khloe said. "We were all sitting there like, 'Kim is so late for dinner and we're starving.' And we're like, 'Where the hell is Kim?'" 

"Then she walked in, and we're like, 'Oh my God!'" Khloe continued. "But we just thought we were going to a family dinner."

But Khloe, 26, doesn't think her sister Kim, 30, needs to race to the altar. "That's where Hollywood is so weird," she said. "She just got engaged. Now people are like, 'Oh my God, where's she getting married?' Most engagements are typically a year… No one has discussed it yet. We're happy that they're engaged."

So when did Kourtney, 32, realize Humphries was The One for Kim? "I think [when I saw] how happy he makes Kim. She's always smiling. There is a different happiness about her. Her priorities are more right with him. He grounds her in a way."

"It's very natural," Khloe added.