Mumbai, Dec 26 : Salman Khan s Rakhi sister Shweta Rohira has planned a special surprise for the superstar on his 51st birthday on Tuesday.Salman, known for portraying myriad shades on the cinematic canvas - be it his iconic Prem avatar, zany police officer of "Dabangg" or a simpleton in "Bajrangi Bhaijaan", will be turning 51 on Tuesday. He will be releasing his own app on his birthday."The gift is surprise which I am planning for sometime, but it will be something hand painted and crafted for sure...Because that area is my specialised area. And somehow bhai is an artist too so I can relate to him that way," Shweta said in a statement. She added: "On his birthday, I would like to wish and pray for him, may God give him all the happiness of this world. And he reaches higher and higher in his career." Talking about her memories with Salman, Shweta said: "Well there are loads of memories but the best one is still the very first day when I gatecrashed his house to tie him rakhi. "That was a special day and most unforgettable."Shweta was in the news for her split with actor Pulkit Samrat. The split came two years after their marriage.