Lupita Nyong'o garnered praises because of her moving performance in '12 Years a Slave'. Apart from the approval of its viewers, the 31-year-old actress similarly gained the admiration of her co-star Brad Pitt.

As per Entertainment Wise's source, the 50-year-old actor is very impressed with the Kenyan actress that he wants to serve as her mentor: "He thinks she's mesmerizing on screen and wants to mentor her."

Due to their alleged closeness, some fans can't help but ask if Brad Pitt is cheating on Angelina Jolie. While promoting the film, Pitt and Nyong'o have been required to stay together.

"In Angelina Jolie's absence they went as each other's dates to both ceremonies and were locked in conversation all night. They also had brunch at his LA home on the day of the SAG Awards after Brad flew in from Australia," claims the same source.

Last January 19, the 'World War Z' actor likewise did not waste time in praising Nyong'o during the Producers Guild Awards in Beverly Hills: "She's very special, a very special young lady. We're going to see great things from her."

Pitt's admiration to the Oscar-nominated actress is allegedly becoming a problem for Jolie. When the 'Fight Club' actor united with his family in Australia, the 'Tomb Raider' actress reportedly didn't feel excited to see her beau.

"He wasn't welcomed with open arms. Angelina read him the riot act when he arrived. She told him that he didn't need to make his 'crush' on Lupita so obvious to the entire world. Angie is working her tail off, juggling directing duties and caring for their kids. Meanwhile, Brad is running around on the other side of the globe acting like a carefree bachelor," reveals another insider to National Enquirer.