I found this photo of her on theYBF.com and I decided to create this look for less. See the items below that will give you this rock star style.
Lazer Cut Zebra Tank
Love the graphics of this affordable tank.
Gold Snake Chain 3-Row Necklace
The chain necklace is a must for the modern edgy look.
Sunglasses $5.80 http://www.forever21.com/
You definitely need the oversized shades for the "star like" style.
Tricotette Harem Pant $58.00 http://www.chicos.com/
These pants look extremely comfy.
Quilted Chain-strap bag
This purse matches the one Rihanna is carrying fabulously.
Gianni Bini Starr pump
These shoes are currently on sale at Dillards.