Kardashian tweeted the news last night that she was back in Los Angeles, ready for an appearance at tonight's MTV Video Movie Awards.
"Back in the US and it feels sooo good!" she wrote. "Had such a fun relaxing time away! Back to reality!"
Kardashian is scheduled to present an award at tonight's televised ceremony, which will pay tribute to pop singer Britney Spears.
The couple married last weekend in a 'fairytale' ceremony which is said to have earned Kardashian around $18m through various sponsorship deals.
The MTV VIdeo Music Awards 2011 airs tonight from 9pm ET/PT on MTV.
Watch a promo for the Britney Spears tribute at tonight's MTV Video Music Awards 2011 below: