Miles Teller -- Mr. Fantastic ... Rescues Pregnant Woman From Riptide

Forget superpowers, Miles Teller's hero game is on fleek ... this weekend the "Fantastic Four" star and his GF swooped in and rescued a pregnant woman caught in a potentially deadly riptide in Miami.

It's pretty amazing ... Teller and GF Keleigh Sperry's romantic beach day was interrupted when an extremely pregnant woman began screaming for help just offshore ... without hesitation the two darted into action and tag-teamed a rescue effort that saved the woman's life.

Once on shore, the two made double sure the woman was alright and then parted ways.

Looks like playing Reed Richards definitely rubbed off on him ... as for the romantic beach day, if saving lives doesn't get you in the mood ... nothin' will.

#lifesavers