Taylor Swift says Blake Lively 'exploited' her

has had enough.

The Daily Mail has learned that the superstar singer was left devastated on Friday when she was subpoenaed as a witness in the case between and .

Despite putting on a brave face - reportedly joining her boyfriend and their respective moms for a Mother's Day lunch - it is understood that Swift, 35, has been 'completely floored' by the legal escalation and is now 'very upset'.

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