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Ritchie, who is allegedly experiencing marriage difficulties with the singer, is hosting a bash in Wiltshire at the start of August.
"This is hardly the action of a man about to be divorced by his wife," a source told the Evening Standard.
"I don't think you organise a 50th birthday party for your wife while at the same time consulting lawyers to end your marriage."
Commenting on the party arrangements, the insider added: "It will be quite spectacular. He's going to push the boat out. He's given it a lot of thought."
The director allegedly sought marriage advice from Sting and Trudie Styler last week.
