The 25-year-old had the news confirmed in a statement by Strictly Come Dancing where she said:
“Wayne and I are delighted to announce that we are expecting our second baby.
“It is very early days, but we couldn’t be happier and Parker will make a wonderful big brother.
“Although this is such an incredible time for us as a family, due to health reasons I am sadly unable to go on the Strictly tour as planned.
“I’m devastated that I’m missing out as I loved Strictly so much and was so looking forward to joining everyone again on the live show.”
The tour starts on 16 January in Birmingham and it’s not yet been revealed who will be taking the singer's place.
Congratulations, Frankie!
Most memorable Strictly Come Dancing moments EVER! SLIDER
1 of 131. Ann Widdecombe as Big Bird
2 of 132. Bruce Forsyth shooing McFly off the dancefloor after Harry Judd won in 2011
3 of 133. Gavin Henson snogging Bruno Tonioli
4 of 134. Mark Ramprakash getting tangled up with his partner Karen Hardy
5 of 135. Russell Grant emerging from a seashell
6 of 136. Nancy Dell'Olio's terrible Halloween performance
7 of 137. Quentin Wilson gets the lowest score ever. Erm, 8 out of 40...
8 of 139. Ann Widdecombe's Paso Doble
9 of 1310. John Sergeant's wasn't much better, mind you...
10 of 1311. Bruce Forsyth and Anton du Beck join forces
11 of 13Russell Grant gets shot out of a cannon
12 of 1312. Ed Balls' EPIC Gangnam Style routine
13 of 13