After spending all week in London promoting her latest album, a moody Rihanna was seen arriving at LAX Airpot in Los Angeles today (November 20) following an exhuastive day-long flight.

The Russian Roulette singer is back in L.A. just in time to meet with her stylist and prepare for Sunday night’s American Music Awards.

Meanwhile, Rihanna has shot down reports she is dating 90210 actor Tristan Wilds.

“This is funny: I had a house party, and you know how you hold house parties and people come over you don’t even know,” she says. “He came by, brought his friends, and everyone was hanging out, but I don’t even have his number. So I don’t know how I could be dating him.”

Like her ex-boyfriend Chris Brown, Rihanna says she is not ready for another relationship. “I don’t think I have all the time for a commitment right now, or the energy. A relationship is another life, another career, really.”