Actress Kristen Stewart attended Katy Perry's 28th birthday bash with another guy, while her beau Robert Pattinson headed to Australia to work on the promotion of their latest film, "The Twilight Saga: Breaking Dawn part 2."

Kristen Stewart was spotted at Katy Perry's birthday party last October 19 held at The Magic Castle in Los Angeles. The 22-year-old actress attended the bash with her boyfriend Robert Pattinson's pal, Marcus Foster.

JustJared.com quoted an unnamed source saying, "[Kristen] looked happy and was surrounded by her friends the whole time."

Katy celebrated her 28th birthday in a vampire-themed costume party and as a Twilight cast, Bella was appropriately invited. Katy stunned everyone as she dressed up as a vampire while her boyfriend John Mayer dressed as zombie hunter.

RadarOnline reported that Summit Entertainment has booked separate hotel rooms for the couple, Kristen Stewart and Robert Pattinson, as a precaution just in case their relationship will not work out just in time for the promo tour of their latest film, "The Twilight Saga: Breaking Dawn Part 2".

The two were reported to be back together and are working on their relationship after it was shattered by Kristen's cheating scandal with her Snow White and the Huntsman director Rupert Sanders during the filming of the movie.

"Despite getting back together, Rob and Kristen will have separate hotel rooms booked for them on the upcoming promotional tour for Breaking Dawn-Part 2. Summit Entertainment isn't taking any chances that the couple will have problems again and be forced to scramble at the last minute to book one of them a posh hotel suite," according to the source of the gossip website.

Is the two getting back together for real or just a publicity stunt?