'The Bold and the Beautiful' spoilers for Dec. 18-22: Katie surprises Wyatt

"The Bold and the Beautiful" cast, which includes Heather Tom (Katie), Darin Brooks (Wyatt), Katherine Kelly Lang (Brooke), Karla Mosley (Maya), Rena Sofer (Quinn), Thorsten Kaye (Ridge), Jacqueline MacInnes Wood (Steffy), Ingo Rademacher (Thorne) and Scott Clifton (Liam), will be featured in the episode of the long-running American soap on Monday. It will show Wyatt being surprised by Katie and a family Christmas dinner at the Forresters.

Spoiler alert! This article has 'Bold and Beautiful' spoilers 2017. Read on to learn more.

Soaps.sheknows and TV Guide report that on Monday, B&B will show Maya in disbelief about Ridge's betrayal of Brooke. Meanwhile, Liam and Steffy will learn that she's having a baby. As for Thorne, he'll continue to meddle in Ridge and Brooke's relationship. Tuesday's episode will show Wyatt learning about Liam and Steffy's exciting news. As for Bill, he'll find out about it from Steffy. Speaking of Steffy, she'll also be bothered by a disturbing daydream that she'll have in this episode.

Brooke finds out about Katie and Wyatt

On Wednesday, the soap will show Bill telling Steffy to find out the truth about her baby's paternity. Elsewhere, Brooke finally discovers Wyatt and Katie's relationship and she'll issue a stern warning about Bill. Thursday's episode will feature Katie wearing Santa-themed lingerie for Wyatt. Meanwhile, Liam will reflect on his complicated relationship with his dad.

Christmas 2017 at the Forrester Mansion

On Friday, the Forresters, Avants and Logans will all gather and spend Christmas at the Forrester mansion. Eric and Brooke will make a toast. Plus, Eric will sing and play the piano as his guests gather around him. A couple's engagement will also be announced. Watch out for familiar faces that will return including Vivienne Avant (Anna Maria Horsford), Julius Avant (Obba Babatunde) and Donna Logan (Jennifer Gareis). Steffy will also consider getting a paternity test to find out who is the father of her baby. Click here to see a few photos of the scenes from CBS.

'The Bold and the Beautiful' recaps of last week's episodes

These dramatic twists and turns follow last week's episodes which include Ridge asking Steffy's blessing before proposing to Brooke and Ridge's romantic marriage proposal. Elsewhere, Thorne confronted Quinn about her affair with Ridge. Quinn explained her side and defended her actions.

"The Bold and the Beautiful" episodes regularly air on Foxtel Arena during weekdays in Australia. It airs on CBS in the US. Stay tuned for more B&B spoilers this Holiday 2017 season.