Example sentences from the web:

• A: When do you plan to tie the knot?
  B: Let me find a boyfriend first!
• So when are you two going to tie the knot?
• The girl I’m going to marry lives in Mauritius and she’ll have her own ideas about where she wants to tie the knot.

If you are curious about the origin of this idiom, check this: Tie the knot – Origin

“Tie the knot” in the news:

Just married! Ciara and Russell Wilson share first picture after fairy tale wedding in British castle with guests including Jennifer Hudson and Kelly Rowland 

Ciara and Russell Wilson are officially married.

The happy couple tied the knot in front of their closest friends and family – including Jennifer Hudson and Kelly Rowland – on Wednesday at a fairy tale castle in Cheshire. 

The bride wore a custom Roberto Cavalli gown as she exchanged vows with the Seattle Seahawks player at the UK’s stunning Peckforton Castle in front of their celeb pals. 

Source: Mail Online

Alabama quarterback Blake Barnett set to tie the knot

Source: Sporting News