Mumbai, Jan 16 (IANS): Actor Sidharth Malhotra, who turned 31, celebrated his birthday with a watermelon treat with his “Kapoor and Sons” co-stars Alia Bhatt and Fawad Khan.

“Yaa ! We're cool like that ;) watermelon cutting @S1dharthM @_fawadakhan_ #HappyBirthdaySid (sic),” tweeted Sidharth's rumoured ladylove Alia.

She posted this with an image in which she is seen eating a slice of watermelon, while Sidharth is posing with another slice and Fawad is looking at Alia.

Sidharth, who made his Bollywood debut with "Student Of The Year", was wished a 'happy birthday' by other celebrities from filmdom too.

“Happy birthday to a student...a friend... a member of our family .....#HappyBirthdaySidharthMalhotra,” shared filmmaker Karan Johar, who helmed "Student Of The Year" that also launched Alia.

Meanwhile, Sidharth's “Villain” co-actor Riteish Deshmukh shared: "Wishing my Villainy friend a stupendous birthday- @S1dharthM have a great one."

“Kapoor and Sons”, a romantic drama produced by filmmaker Karan, will see Alia, Sidharth and Fawad sharing screen space for the first time. The male leads will be seen playing the role of writers.

The film is slated to hit theatres on March 18 next year.