VIDEO : Christina Aguilera Celebrates Her Daughter's First Birthday With an Adorable Photo

Christina Aguilera's daughter, Summer Rain, is getting so big! The singer took to Instagram on Aug. 16 to wish her gorgeous little girl a happy birthday. Christina, who also shared a cute home video of her kids in July, posted a photo of Summer sitting next to a giant pink balloon in an apple print dress, with the caption, "Happy 1st Birthday! My Sweet, Summer Rain." Summer's dad, Matthew Rutler, who popped the question to Christina in February 2014, also gave his daughter a sweet shoutout via Twitter. "You light up life. Happy First Birthday, Summer," he wrote, alongside a precious photo of them cuddling in the sunshine.