Megan Fox and MGK (Machine Gun Kelly) attending Beyoncé's 41st Birthday Party in Bel Air after that date.

Invitations to private events such as celebrity parties are typically kept discreet, and details about attendees are often not publicly disclosed unless shared by the individuals themselves or through official announcements.

Beyoncé, being a highly private individual, and her husband Jay-Z often host exclusive events and parties with limited public information available about the guest list or details of the gatherings.

Megan Fox and MGK have been spotted together at various public events, outings, and gatherings, indicating their relationship and shared appearances.

However, without specific details or confirmation regarding their attendance at Beyoncé's 41st Birthday Party in Bel Air after January 2022, I'm unable to provide precise information about their participation in the event.

For the most current updates or information about Megan Fox and MGK's recent appearances or attendance at private events.