Rihanna's new album 'Unapologetic' has topped the charts here in the States, but it's also a big hit all over Europe, and she's been busy rewarding her fans on the other side of the pond with a series of publicity appearances and live performances.

In fact, she recently popped up on a pair of European TV shows to make an appearance and perform live -- like the U.K. edition of 'X Factor,' where she delivered a live rendition of her current hit 'Stay,' and the long-running German television institution 'Wetten, dass...?,' where she treated the audience to a run-through of the album's leadoff single, 'Diamonds.'

It's all part of the big lead-up to the Diamonds World Tour, which will take Rihanna all over the globe with a packed series of dates that are set to begin in March. She'll perform around the U.S. until May, when she returns to Europe for a summer filled with stamping her passport all across the continent. It'll all add up to a typically busy year for the singer -- but one that still might be less exhausting than her whirlwind 777 Tour. Get a taste of what's to come in the two videos embedded below.

Rihanna Sings 'Diamonds' on 'Wetten, dass...?'

Rihanna Sings 'Stay' on 'X Factor U.K.'