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Lauren Silverman, Simon Cowell

Dave J Hogan/Getty Images

Simon Cowell sure knows how to treat a lady on her birthday!

The X-Factor judge celebrated girlfriend Lauren Silverman's special day by giving her the best gift any partner could ask for: bling! And from what we know about Cowell, the new dad would never disappoint in the jewelry department.

Gifts aside, Silverman was able to enjoy turning 37 with Cowell and her two sons Saturday. Silverman has one son from her previous marriage.

"It was a happy, relaxing day," a source tells E! News. "Everything with them is great." 

Simon Cowell, Lauren Silverman

AKM-GSI

During the evening, Cowell also treated Silverman to a small dinner party at Red Stixs, an upscale Chinese restaurant in the Hamptons. While there, guests sang Happy Birthday to Silverman who was presented with a gorgeous cake.

"They've been there a lot this summer," another source told E! News of the couple's dinner destination. "They seem to really love it."

While the couple has enjoyed spending quality time in the Hamptons, a new vacation destination could soon be in their future.

"It will be on a boat," a source hinted to E! News. "Everyone's really looking forward to it."