Alesha announced she was expecting with dancer boyfriend Azuka Ononye on Thursday, and her 'Britain's Got Talent' co-judge was one of the first to send her well wishes on Twitter.
Mother-of-two Amanda wrote: "Phew! and so happy for my girl @AleshaOfficial and Torso ! Can you imagine how beautiful that little one will be?!!"
Sounds like Amanda has been sitting on that secret for a while.
A statement released by Alesha's reps revealed her happy news.
It read: "Alesha Dixon and her partner Azuka Ononye are delighted to announce that they are expecting their first child later this year.
"Alesha and Azuka are looking forward to this happy chapter in their lives and would request privacy to enjoy this happy and most important event."
Alesha has been notoriously private about her love life, never publicly commenting on rumours about their relationship.
The couple first met in 2006, but friendship reportedly turned into romance in 2010, following the promotion of her album 'The Entertainer'.
Alesha - who has just been announced as a host on new ITV celebrity singing show, 'Your Face Sounds Familiar' - was previously married to rapper MC Harvey, but the couple divorced after he cheated on her with former 'Popstars: The Rivals' contestant Javine Hylton.