But other band mate Nadine Coyle was noticeably silent on the matter, despite taking to Twitter to thank fans praising her for her performance in Lord of the Dance.
Coyle posted the message from one Twitter user: 'She appears three times, gorgeous in shimmering gowns and comfortable as ever on the stage bringing fine voice and genuine star quality to proceedings.'
The Irish star thanked the tweeter, but did not address the news that her former bandmate had given birth the previous day.
Nicola Roberts on the other hand, was obviously overcome with emotion, sharing a picture of a tear rolling down a cheek with the caption: 'These are the kind of ones that happen when Kimberley my <3 now has a baby..So so proud of you xo.'
Cheryl Cole was also quick to respond to Walsh's twitter announcement, adding that her baby boy was 'perfect.'