This year's birthday seems to have been very special for the gorgeous Hansika Motwani. The "Singam 2" actress celebrated her birthday by partying with her boyfriend Simbu (aka STR).

Hansika, who turned 22 on 9 August, was spotted having a good time with Simbu. Party pictures of the duo are doing rounds on the internet.

On the eve of her birthday, Simbu posted a birthday wish on micro-blogging site Twitter. "Many more happy returns of the day my princess @ihansika ... love u and god bless u ma :)" he said.

Along with the message, a picture of a beautiful princess cake was also posted. Simbu is said to have gifted the pretty lass the cake. However, it is not known as to what special gift Simbu gave his ladylove.

"About @iam_STR gift. . i will let you know all later .its just a very adorable present. :)" Hansika posted the message on her Twitter handle.

Hansika and Simbu, who initially denied reports that they were seeing each other, finally came out in the open about their relationship last month. The young stars of south cinema confirmed their love on the social networking site, surprising their fans. 

"Been hearing to many rumours abt my personal life, so jus wana clear.yes!I'm seeing Str:)n hence I wouldnt like 2talk abt my personal life," Hansika said.

Following her message, Simbu also tweeted that he is in love with Hansika and that their marriage will be decided by their family.

The duo will be seen sharing screen space for the first time in their upcoming Tamil film "Vaalu". Fans will be eagerly waiting to see their chemistry in the film, post their public declaration of love. The young actors will also be seen in another film titled "Vettai Mannan".