By Amber Goodhand - Breaking Celebrity News News Editor

Rihanna has been sharing photos from her exotic vacation for the last week, but Breaking Celebrity News has exclusively learned photos the pop singer shared on Wednesday night have friends and family concerned.

The photo raising eyebrows shows Rihanna, 24, curled up in the front seat of a convertible after a day on the yacht with the caption, "#phuckyoconvertable."

"Rihanna was super close to her grandma," an insider exclusively told Breaking Celebrity News.

"So her partying was out of control before her grandma even died because Rihanna couldn't deal with her being so sick and the thought of losing her was too much."

The source reveals that when Rihanna's beloved grandmother Dolly passed away on July 1 after losing her battle to cancer, the Barbados beauty just lost it.

"Rihanna is using the partying as an escape so she doesn't have to deal with the loss of her grandma," the source said.