The two girls - who are being mentored in the singing competition by Nicole Scherzinger - were spotted leaving their X Factor mansion earlier this morning (17 October) in similar RiRi-esque ensembles, before making their way to Wembley to practice for Saturday night's show.
Hannah, 17, appeared to be particularly keen on copying the Bajan superstar's fashion sense, since she was pictured wearing a red bomber jacket from Rihanna's River Island collection.
She teamed her cool outerwear with a T-shirt that had the words 'Fashion Addict' printed on the front, a pair of skinny jeans, some black trainers and a beanie hat from Dimepiece LA.
The college student also donned a pair of circular framed sunglasses to shield her eyes and carried a large brown handbag packed full of her essentials for the busy day.
Earlier this week, Hannah was treated to a shopping spree in River Island with mentor Nicole and there's no prizes for guessing which items in the store she ran straight up to!
But she isn't the only one who appears to be looking to Rihanna for some fashion tips, as 16-year-old Tamera was also seen sporting an outfit that looked as though it was taken from the 'Diamonds' singer's wardrobe.
She wore a white cropped T-shirt, a pair of leather-esque leggings, a black leather jacket and some see-through Dr Martens style boots.
Tamera - who is being backed to win X Factor by Katie Price - completed her outfit with a black beanie hat similar to Hannah's and some gold jewellery.
The two girls breezed through their first live show last weekend, effortlessly belting out a couple of classics in keeping with the 80s theme of the week.
And no doubt they're going to be on top form this weekend too. But with the theme being 'Love & Heartbreak' we wonder what they will be singing?!
What do you think of Hannah and Tamera's Rihanna inspired outfits? Let us know below, as the best comment each week wins £50!