Selena Gomez was reportedly spotted at an Oscar after party over the weekend drunk and stumbling while she partied the night away with her friend Vanessa Hudgens. A source told Radar Online that she was spotted sipping on champagne and other "light liquors" throughout the evening.

"Selena was drinking constantly throughout the entire party when I saw her," the source said. "She was having a grand old time and towards the tail end she was stumbling in her heels and almost toppled over."

This rumor comes after Gomez's rep revealed that the 21-year-old completed a secret stint in rehab back in January. According to reports, her rep claims the "Come & Get It" singer sought treatment for exhaustion and it had nothing to do with substance abuse.

However, there were rumors that Gomez's parents urged her to check into rehab because she was partying too much. A different source who claims to have also saw Gomez at the Vanity Fair party told Radar that the singer was a little drunk but it was nothing to be alarmed about.

"Selena and Vanessa were just having a really good time, laughing and taking pics," the source said. "She wasn't slurring too bad, but was definitely in the happy-sleepy stage."

According to a Feb. report by Radar, Gomez voluntarily checked into Dawn at the Meadows rehab center in Arizona. Her parents were reportedly the ones who pushed her to do it so she could get herself "cleaned up."

"With fame came a partying lifestyle," a source told the site.

"Her friends and family became increasingly worried that there might be a serious problem with Selena," the source added. "Particularly, her parents [were worried]. The partying was, at times, wild. They wanted to help her - and they very much encouraged her to go to rehab. Others very close to her also urged her to seek professional help."