It has been a tough time for Rihanna following the death of her Grandmother Dolly last week, but the “Umbrella” songstress was in top form over the weekend at London’s Wireless Festival. Ri-Ri took the stage in a curve-revealing outfit as she mesmerized the crowd with a set list stacked with hit songs. During her performance, the “Take a Bow” babe looked to be having a blast, showing off her million-dollar smile as fans cheered her on. However, below the surface she still seemed to be dealing with her grief over her grandmother’s death.

After the gig, Rihanna, Ne-Yo, and her friend Melissa Forde headed out to the Jalouse nightclub in downtown London where they partied into the wee hours. An insider told press Rihanna’s behavior shows signs that she’s in trouble. “She’s a party girl. She loves to have fun and drink, and there are a lot of times that she’s not thinking straight. She’s wild.”