Weddings are definitely a good way to unite people including those who aren't the bride and groom just like on again off again Hollywood celebrity couple Katy Perry and John Mayer who were both spotted displaying some sweetness at 'Girls' star Allison Williams' wedding with husband Ricky Van Veen earlier this weekend.

It was a good Saturday afternoon for Williams and her groom, Van Veen as the two finally tied the knot after being engaged back in February 2014. But it was even better for the fans of the lovely Hollywood couple, Perry and Mayer who seemed to have tried their relationship one more time after reportedly breaking up last July.

The two are definitely causing a lot of headlines after being spotted and photographed holding hands and displaying some PDA throughout the ceremony at a ranch out West. The couple had big smiles on their faces as they sat beside each other showing signs that they are indeed back on yet again.

Who could blame them? The two are in fact looking good together in Mayer's classic black suit and necktie with a pair of sunglasses and Perry in a floral dress with her black colored hair flowing down. Meanwhile fashion wise, the bride also was stunning in her Oscar de la Renta handmade couture gown.

Reports also claim that several other big-named celebrities were in attendance to witness the beautiful wedding of the famous bride and her groom. Bruce Springsteen, Andy Cohen, Tom Hanks with wife Rita Wilson, Lena Dunham, Mindy Kaling and Jemima Kirke were said to have been there.

Williams' groom, Van Veen was said to be a 34-year-old co-founder of College Humor. The newlyweds have reportedly met back in 2011 while Williams was shooting the pilot for 'Girls' and since then the two have kicked off their relationship that finally led to their wedding.