Continuing along with her adventure through Europe before returning to the States for next weekend’s MTV VMAs, Katy Perry was busily working away in Berlin, Germany on Sunday (September 5).

All dolled up, the “California Gurls” cutie attended the Deutsche Telekom booth at the IFA trade fair to promote the extended deadline to participate in her upcoming “Firework” video shoot.

Open to German fans, those interested can apply at Facebook.com/meet.katy from now until the new September 8th deadline.

The visit to Berlin comes after Katy spent time in Paris and London, as she tweeted about her UK hospitality, “Staying at Claridge’s was like sleeping in a Tiffany’s box! Divine, classic beauty. I love you London.”

The “Russian Roulette” songstress looked pretty camera shy as she walked through the security checkpoint at Schoenfeld Airport and hopped on a departing flight.

Earlier in the evening, Rihanna was over at the Palais am Funkturm in Berlin for the 2010 Echo Awards, the German equivalent of the Grammys.

During the course of the evening, Ri-Ri took the stage in a sexy black bodysuit to perform her latest hit “Rude Boy.”

The Barbadian singer looked cute in a black Puma hat and shades as she cracked a smile for the snapping photogs.

The soundcheck is just ahead of the annual ECHO awards which are taking place this Thursday (March 4) at the Berlin Funkturm.

ECHO is a German music award granted every year determined by the previous year’s sales. Beyonce, Lady Gaga and Whitney Houston will all be making appearances as well.

The “Bridget Jones” actress looked gorgeous in a black off-the-shoulder, puffy sleeved frock and smiled beautifully for the flashing cameras.

Saturday’s premiere of the film “Otouto” marks the final event of the 60th Berlinale Film Fest.

Aside from her appearances in Berlin, Zellweger has been the topic of numerous gossip columns suggesting she may be pregnant with Bradley Cooper’s baby. Although one of her reps denies this, reports that she is prego continue to trickle out on the web.