The yet to be titled movie is being produced by Tips Films.
"Working with my first n my most favourite co-star @geneliad after 7 long years. Today is the first day of the shoot. Excitttteeeeddd yeaahh (sic)," Riteish said on micro-blogging site Twitter.
Riteish and Genelia made their debut in Bollywood together in 2003 with `Tujhe Meri Kasam`. Though the movie was average but Riteish-Genelia chemistry worked pretty well.
Later, the duo worked together in `Masti` (2004).
An excited Genelia said, "My new film starts 2day, workin with @Riteishd after 7yrs.lllongggg time but excited 4sure.
Need your prayers n wishes tweeps, bring it on (sic)."
"Dats such a sweet tweet rd (Riteish), I think its goin 2b so much fun again, fingers crossed (sic)," Genelia tweeted soon after Riteish expressed his enthusiasm.
There is a buzz in B-town that Riteish and Genelia, who have been dating each other for long, will be tying the knot in 2012. But both actors have never come on record about their relationship status, they have maintained the `we are just good friends` stance.
Also, Riteish said, "My first film with TIPS - Kumarji (Taurani)- have been wanting to work with them for a long time."