That was a quick trip! Kim Kardashian chartered a private jet for one, thank you, to head down to New Orleans for tennis superstar pal Serena Williams' wedding to Reddit founder Alexis Ohanian. Yep, she was solo -- hubby Kanye West stayed home and in fact, Kim attended the wedding, stayed for a bit of the reception, left early and hopped right back on the same jet and flew home!

The reality TV star/entrepreneur has a new business to baby ... oh, and she's got a baby on the way, too, of course -- her new fragrance line netted a whopping $10 million in it's first day after launching! That's nothing new for the Kardashians, Kim's just following in the footsteps of younger step-sis Kylie, who's makeup business is on track for a $1 billion valuation by early next year! And hey, if holiday sales go well, she may reach the mark before the end of 2017.

So Kim enjoyed Serena's festivities, along with other guests like Eva Longoria, Kelly Rowland, La La Anthony, Anna Wintour and more, and then jumped back on the plane around midnight, touching down in LA about three and a half hours later. What a party pooper!

And so back to Kanye's absence ... there may be more to it other than the rapper just being too busy to attend the wedding. In Touch Weekly claims the uber-famous couple's marriage is on the rocks and that they're headed for DIVORCE! Well we happen to have some of our own news about that ... coming soon ... but in the meantime, we can tell you the mag reports the couple goes for days at a time without talking -- Kanye loves to give Kim the silent treatment -- and that Kim's worried about their baby (via surrogate) coming right around the holidays and things get increasingly tense between her and Yeezy.

Stay tuned for more EXCLUSIVE info about Kim and Kanye's marital troubles, right here on X17online!