As sunny as it was Tuesday in Malibu, a dark cloud appeared to hang over Kim and Kanye as they left a late lunch date at the seaside sushi restaurant.

Kanye was looking down as he left with his wife and Kim didn't exactly have a smile on her face either ... wonder what they were discussing over salmon sashimi?!

The two arrived separately -- Kim having come from mom Kris' house and Kanye from his studio in Calabasas. Sure, it's a little strange they'd drive so far separately when Kris' house and Kanye's studio are only a few minutes from each other and Nobu is a good 45 min drive, but ...

Mr. and Mrs. West enjoyed a family day at Disneyland on Monday and both were all smiles as they rode rides with the kids. Kim and Kanye didn't appear to have tons of interaction with each other -- it looked like the outing was more for Nori than anything.

Kanye recently returned from a creative trip to Wyoming where he was working on new music, while Kim had to attend the TV upfronts in New York to promote the family's reality show. So they've spent a fair amount of time apart recently.

So what are we trying to say here? Is there trouble in paradise? Meanwhile, Kim continues to lose weight ...