Rihanna Shows Off New Under-Boob Tattoo, Tells Piers Morgan to "Grow a Dick"

RiRi's newest risque tat.

Via twitter.com/Rihanna

See also "Rihanna Announces Diamonds 2013 World Tour, Coming to South Florida in April."

Rihanna's under-boob made a surprise appearance on Twitter last night, all in honor of Dolly, the singer's late grandmother.

Covering her breasts with an arm, Rihanna tweeted a picture of her latest tattoo, an upper ribcage piece depicting Isis, the ancient Egyptian goddess of motherhood, magic, and fertility.

"Goddess Isis- Complete Woman - Model for future generations," Rihanna wrote in the message. "#GRANGRANDOLLY - always in and on my heart."

Her mind, however, is currently preoccupied with Piers Morgan's "dick."



About an hour before Rihanna tweeted the picture of Grandma Dolly's tribute piece, an unprovoked Piers Morgan subtly bashed the Barbadian pop star's appearance.

She had joined Coldplay and Jay-Z on stage during the closing ceremonies of the Paralympics, much the chagrin of the CNN talk show host.

"I think @Rihanna needs to grow her hair back," Morgan tweeted. "Fast."

Having learned from her tumultuous relationship with Chris Brown to never take shit from another man again, Rihanna quickly retweeted Morgan, offering a bit of advice in the process.

"Grow a dick," Rihanna suggested. "Fast."

Rihanna's Diamonds World Tour. Saturday, April 20, 2013. BankAtlantic Center, 1 Panther Pkwy., Sunrise. The show starts at 7:30 p.m. and tickets cost $35.75 to $121.25 plus fees via ticketmaster.com. Call 954-835-8000 or visit bankatlanticcenter.com.

Follow Crossfade on Facebook and Twitter @Crossfade_SFL.