Article continues below advertisementGisele Bündchen is ringing in 45 surrounded by the people who matter most.Article continues below advertisementSource: @gisele/InstagramArticle continues below advertisementThe supermodel gave fans a rare peek into her low-key birthday celebration on Saturday, July 20, sharing sweet family moments from Rio Grande do Sul - the southernmost state in her native Brazil.In one heartwarming shot, the model was seen smiling next to boyfriend Joaquim Valente, who held their new baby close as the couple joined loved ones at a long dinner table.