Like Julia Roberts in My Best Friend's Wedding, the hero of Mere Yaar Ki Shaadi Hai, i.e, Uday Chopra comes to know that his childhood love Sanjana is going to be married to a suitable boy Jimmi Shergill. The same wedding environment, the same plethora of characters(with the task of understanding their mutual relationships being left to the audience), the same colourful garments, the same jovial songs, the same intermittent doses of sentiments and the same all's well that ends well kind of climax after a few twists here and there in the story. The complete movie, though it's entertaining, takes the oft-beaten path in terms of characters, events and milieu seen many earlier movies made under the YRF and the Rajshri(Sooraj Barjaatya) banners of Bollywood. Otherwise also, neither the screenplay writer Mayur Puri, nor the director Sanjay Gadhvi, nor the filmmaker Aaditya Chopra has done to insert anything original in the movie.
In other words, Mere Yaar Ki Shaadi Hai is that version of My Best Friend's Wedding in which the gender of the main protagonist is changed from female to male. However, the difference between these two movies is that the pivotal character of My Best Friend's Wedding is the heroine whose role has been played by Julia Roberts whereas the pivotal character of Mere Yaar Ki Shaadi Hai is the hero whose role has been played by Uday Chopra. But the height of copycatting is that the makers could not think of even an original title for the movie and they translated the title of the Hollywood movie itself in Hindi(Mere Yaar Ki Shaadi means my best friend's wedding only). In a way, it was a prudent step on their part because those who had seen the Hollywood movie or heard about it, came to know in advance as to what to expect in the film. Mere Yaar Ki Shaadi Hai(2002) is such a movie made under the prestigious Yashraj Films banner of Bollywood about which the makers had revealed in advance(much before the release of the movie) that its story had been lifted from Hollywood comedy - My Best Friend's Wedding(1997). Sometimes they do not reveal the source of the story and shamelessly take its credit but sometimes they reveal it in advance.
Bollywood filmmakers are habitual of lifting the story ideas, plots and sometimes the whole scripts from foreign movies(and old Indian movies too).