Rochelle Humes of The Saturdays visits the Young Hollywood Studio on September 5, 2012 in Los Angeles, California. Credit: Nick Rood/Young Hollywood/Getty Images

Rochelle Humes has a bun in the oven!

The 23-year-old singer -- one-fifth of the British girl group The Saturdays -- married JLS singer Marvin Humes on July 27 after a two-year courtship. "This year has been full of incredible moments, including getting married, but finding out I was pregnant was by far the best moment of all," the pop star tells E! News.

Humes will be the second band member to become a mother, as Una Healy welcomed daughter Aoife Belle on March 13. (The other Saturdays singers are Mollie King, Frankie Sandford and Vanessa White.)

The band will be featured in a new E! reality series, Chasing The Saturdays, premiering Sunday, Jan. 20, 2013 at 10 p.m. EST.