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January Jones was spotted at a clinic in Beverly Hills just a day after revealing her pregnancy!

Jones, 33, is expecting her first child this fall, she announced Thursday.

"She's really looking forward to this new chapter in her life as a single mom," a source told People.

Jones hasn't said who the father is, but it sounds from that statement like the Mad Men actress doesn't expect the mystery man to be very involved.

Jones has dated a few fellow actors recently. We name them and speculate about who the father could be after the jump!