Jauregu, 20, said the "Commander" singer praised the girl group for not letting the departure of Camila Cabello affect them as a band, reported FemaleFirst.
"We got advice from Kelly Rowland. She's so real and so genuine when she speaks to us. She saw us and was like, 'I'm so proud of y'all for sticking together and being strong together.'
"She told us, 'Let everything out in your music. Just go in there and write your faces off. Let the music speak for itself'," said Jauregu.
The band rose to fame since appearing on US talent competition "The X Factor" in 2012.