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Lindsay Lohan, Samantha Ronson

Chris Weeks/Getty Images

Lindsay Lohan is on a winning streak.

The young starlet spent the weekend in Las Vegas. She started things off with a party for her new, second line of leggings at Caesars Palace's Pure nightclub, where girlfriend Samantha Ronson was deejaying (above).

LiLo was spotted the next day grabbing a late sushi lunch at Simon at Palms Place. A few hours later, she went to see Madonna's concert at the MGM Grand Garden Arena. She had a second-row seat in front of the stage's runway next to Taye Diggs, who was there with a buddy.

"She was really enjoying herself, dancing around," a fellow concertgoer says of Lohan.

The dancing apparently continued into the wee hours. I'm told Lohan hosted an impromptu postconcert party in her $10,000-a-night Palms Place penthouse suite. According to a source, there were about 50 people—including some of Madonna's dancers—at the bash. Things didn't die down until about 4 a.m.

But overall, it was a good time for all, with no problems reported.

Lohan wasn't the only one in Sin City this weekend. Ellen Pompeo and hubby Chris Ivery toasted their first wedding anniversary with pals Diggs and Kate Walsh during Tao's third-anniversary party.