People magazine says that Kevin Federline and Justin Timberlake were both in Vegas Thursday night. Turns out that the two have slightly different ideas of "fun." In fact, before you read any further, try and guess whose weekend in Vegas will include "ultra-exclusive" hotels and high-roller tables, and whose weekend will consist of cagefights and slot machines. Think you got it? Read on:

Timberlake, who is performing Friday night at the MGM Grand, came to town with best friend Trace Ayala. He began his visit at the Mirage, playing blackjack in the high-rollers lounge for an hour, before heading to the Hard Rock Hotel's Nobu for a sushi dinner with a small group of friends.

…he looked "very mellow and cool," said one observer at the restaurant. He "gave off a casual and comfortable vibe."

After dinner, Timberlake hung out at the MGM Grand Mansion, an ultra-exclusive hotel modeled after an 18th century Tuscan villa and reserved for celebrities and Vegas's high rollers.

Meanwhile, Federline, in town to check out the World Extreme Cagefighting matches at the Hard Rock on Saturday, played the slot machines at the Venetian with friends before hitting the Tao nightclub, where go-go dancers entertained the crowd beneath sprinkles of artificial snow.

While the vibe around Timberlake was "mellow and cool," onlookers described the vibe around Federline as "gloomy and dirty, like Pigpen from Peanuts." J/K. Actually, People describes Federline as "also mellow" and says he "wasn't drinking much."

All the while, this girl's changing clothes in gas station bathrooms, chewing with her mouth open and making everyone feel embarrassed for her. Honestly, even if you really hate yourself for having to admit it, you gotta start liking Kevin Federline's ambition more than Britney Spears' self-destruction. Sorry.

[Source]